Antique Fountain Pens

This site contains affiliate links for which I may be compensated

Vintage & Collectible Rollerball Pens

Subcategories:
Acme Rollerball Pens Assorted Rollerball Pens	Cross Rollerball Pens Montblanc Rollerball Pens	Parker Rollerball Pens Waterman Rollerball Pens

Auctions

Buy It Now

All

12,691 items		Price	Shipping	Total	Time Left
Page: First ... 33 34 35 36 37 38 39 40 41 [42] 43 44 45 46 47 48 49 50 51 52 ... Last
Buy Now »	Retro 51 Tornado Deluxe Calico Tortoise Acrylic ARR-1404 UNOPENED
	Details » Buy Now for $750.00 »	Buy: $750.00	Ships: Based on Zip	$750.00 Plus shipping	4 days 22 hrs 22 mins
	Item Condition: New Item Location: Henderson, NV, USA ZIP 890 Shipping Type: Calculated Handling Time: 3 business days Seller: koopla Feedback: 862 / 100%** See other items for sale from koopla
Buy Now »	Sheaffer Agio Pink Rollerball Pen (Ink not included)
	Details » Buy Now for $60.00 »	Buy: $60.00	Ships: $6.00	$66.00	4 days 22 hrs 27 mins
	Item Condition: New Item Location: Harrisville, RI, USA ZIP 028 Shipping Type: Flat Rate Shipping Cost: $6.00 Handling Time: 3 business days Seller: penatic Feedback: 23 / 100%** See other items for sale from penatic
Buy Now »	Montblanc Classique Solitaire Vermeil Sterling Silver Ag925 Gold Ballpoint 164v
	Details » Buy Now for $355.00 »	Buy: $355.00	Ships: $8.95	$363.95	4 days 22 hrs 29 mins
	Item Condition: Used Item Location: Skokie, IL, USA ZIP 600** Shipping Type: Flat Rate Shipping Cost: $8.95 Handling Time: 2 business days Seller: nwfinejewelers Feedback: 23,932 / 99.4% Top-Rated Seller See other items for sale from nwfinejewelers
Bid Now »	Montblanc LeGrand Rollerball Platinum Trim Nearly Mint
	Details » Bid on This Item (1 bid) »	Bid: $90.00	Ships: $15.00	$105.00	4 days 22 hrs 37 mins
	Item Condition: Used Item Location: Miami, FL, USA ZIP 331 Shipping Type: Flat Rate Shipping Cost: $15.00 Expedited Shipping Handling Time: 3 business days Seller: mcgsteph Feedback: 192 / 100%** See other items for sale from mcgsteph
Buy Now »	MONTBLANC Heritage Rouge et Noir "Baby" Special Edition Rollerball Pen 128122
	Details » Buy Now for $560.50 »	Buy: $560.50	Ships: Free	$560.50	4 days 22 hrs 49 mins
	Item Condition: New Item Location: Los Angeles, CA, USA ZIP 900** Shipping Type: Free Returns Accepted Seller: watchwarehouse Feedback: 19,741 / 97.3% Top-Rated Seller See other items for sale from watchwarehouse
Buy Now »	Vintage ACME Studio “NEW YORK METROPOLITAN OPERA” Roller Ball Pen - NEW
	Details » Buy Now for $245.00 »	Buy: $245.00	Ships: Free	$245.00	4 days 22 hrs 52 mins
	Item Condition: New Item Location: West Hollywood, CA, USA ZIP 900** Shipping Type: Free Handling Time: 5 business days Seller: design_mafia Feedback: 2,896 / 97.5% See other items for sale from design_mafia
Buy Now »	Mickey Collector Ceramic Roller Ball Pen w/ Special Collector Gift Tin Black Ink
	Details » Buy Now for $10.00 »	Buy: $10.00	Ships: $5.00	$15.00	4 days 22 hrs 52 mins
	Item Condition: New Item Location: Palatine, IL, USA ZIP 600** Shipping Type: Flat Rate Shipping Cost: $5.00 Handling Time: 2 business days Seller: carl.dre Feedback: 428 / 99.1% See other items for sale from carl.dre
Buy Now »	Retro 51 Marco Polo LE (#010 of 957) Brand New Sealed
	Details » Buy Now for $109.95 »	Buy: $109.95	Ships: $5.95	$115.90	4 days 22 hrs 54 mins
	Item Condition: New Item Location: Asheville, NC, USA ZIP 288 Shipping Type: Flat Rate Shipping Cost: $5.95 Handling Time: 2 business days Seller: jiffynutwagon Feedback: 187 / 100%** See other items for sale from jiffynutwagon
Buy Now »	Retro 51 Black Cherry Tornado Snapper Ballpoint Pen (TSB-016) - New/Sealed
	Details » Buy Now for $150.00 »	Buy: $150.00	Ships: Free	$150.00	4 days 22 hrs 54 mins
	Item Condition: New Item Location: Denver, CO, USA ZIP 802** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: rino-distribution Feedback: 7,994 / 99.5% Top-Rated Seller See other items for sale from rino-distribution
Buy Now »	Gisi Pen Company Norman Soldier Limited Edition Rollerball Pen
	Details » Buy Now for $2,950.00 »	Buy: $2,950.00	Ships: $55.00	$3,005.00	4 days 22 hrs 55 mins
	Item Condition: New Item Location: Maple Valley, WA, USA ZIP 980 Shipping Type: Flat Rate Shipping Cost: $55.00 Expedited Shipping Handling Time: 1 business day Seller: stylophiles Feedback: 487 / 100%** See other items for sale from stylophiles
Buy Now »	Parker Vintage Reflex Blue Roller ball Pen
	Details » Buy Now for $11.55 »	Buy: $11.55	Ships: $7.50	$19.05	4 days 22 hrs 58 mins
	Item Condition: Used Item Location: Memphis, TN, USA ZIP 381** Shipping Type: Flat Rate Shipping Cost: $7.50 Handling Time: 1 business day Returns Accepted Seller: rgbpd1 Feedback: 33,279 / 99.6% Top-Rated Seller See other items for sale from rgbpd1
Buy Now »	SHEAFFER - 100 Ballpoint Pen - BRUSHED CHROME & TRANSLUCENT RED
	Details » Buy Now for $13.95 »	Buy: $13.95	Ships: Free	$13.95	4 days 23 hrs
	Item Condition: New Item Location: East Greenwich, RI, USA ZIP 028** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: pensavings Feedback: 84,576 / 99.7% Top-Rated Seller See other items for sale from pensavings
Buy Now »	Archived ACME Studio "Dots Red" Twist Ballpoint Pen by CHARLES & RAY EAMES - NEW
	Details » Buy Now for $150.00 »	Buy: $150.00	Ships: $9.90	$159.90	4 days 23 hrs 3 mins
	Item Condition: New Item Location: West Hollywood, CA, USA ZIP 900** Shipping Type: Flat Rate Shipping Cost: $9.90 Handling Time: 5 business days Seller: design_mafia Feedback: 2,896 / 97.5% See other items for sale from design_mafia
Buy Now »	Aurora Style Gemstone Rollerball Pen - Rose Quartz - New in Box E72-QR
	Details » Buy Now for $91.95 »	Buy: $91.95	Ships: Free	$91.95	4 days 23 hrs 8 mins
	Item Condition: New Item Location: Matawan, NJ, USA ZIP 077** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: goldspotpens Feedback: 56,267 / 99.7% Top-Rated Seller See other items for sale from goldspotpens
Buy Now »	Vintage ACME Studio Rollerball Pen Prototype Sample for Europe’s ABLV BANK NEW
	Details » Buy Now for $275.00 »	Buy: $275.00	Ships: Free	$275.00	4 days 23 hrs 12 mins
	Item Condition: New Item Location: West Hollywood, CA, USA ZIP 900** Shipping Type: Free Handling Time: 5 business days Seller: design_mafia Feedback: 2,896 / 97.5% See other items for sale from design_mafia
Buy Now »	Pineider La Grande Bellezza Gemstone Rollerball Pen, Tigers Yellow, Italian Made
	Details » Buy Now for $119.00 »	Buy: $119.00	Ships: Free	$119.00	4 days 23 hrs 16 mins
	Item Condition: New Item Location: East Greenwich, RI, USA ZIP 028** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: pensavings Feedback: 84,576 / 99.7% Top-Rated Seller See other items for sale from pensavings
Buy Now »	Pineider La Grande Bellezza Gemstone Rollerball Pen, Stone Black
	Details » Buy Now for $119.00 »	Buy: $119.00	Ships: Free	$119.00	4 days 23 hrs 17 mins
	Item Condition: New Item Location: East Greenwich, RI, USA ZIP 028** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: pensavings Feedback: 84,576 / 99.7% Top-Rated Seller See other items for sale from pensavings
Buy Now »	Aurora Style Resin Rollerball Pen - Blue with Chrome Trim - New in Box E72CB
	Details » Buy Now for $81.95 »	Buy: $81.95	Ships: Free	$81.95	4 days 23 hrs 20 mins
	Item Condition: New Item Location: Matawan, NJ, USA ZIP 077** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: goldspotpens Feedback: 56,267 / 99.7% Top-Rated Seller See other items for sale from goldspotpens
Buy Now »	New Montegrappa Reminiscence Sterling Silver Engraved Rollerball Pen
	Details » Buy Now for $789.95 »	Buy: $789.95	Ships: $14.95	$804.90	4 days 23 hrs 20 mins
	Item Condition: New Item Location: Jackson, MS, USA ZIP 392 Shipping Type: Flat Rate Shipping Cost: $14.95 Handling Time: 1 business day Returns Accepted Seller: kilt Feedback: 4,273 / 100%** Top-Rated Seller See other items for sale from kilt
Buy Now »	Cross Calais Rollerball Pen, White & Rose Gold, New In Box
	Details » Buy Now for $26.95 »	Buy: $26.95	Ships: Free	$26.95	4 days 23 hrs 23 mins
	Item Condition: New Item Location: East Greenwich, RI, USA ZIP 028** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: pensavings Feedback: 84,705 / 99.7% Top-Rated Seller See other items for sale from pensavings
Buy Now »	Montblanc Meisterstuck Starwalker Midnight Black Fineliner
	Details » Buy Now for $275.00 »	Buy: $275.00	Ships: $7.00	$282.00	4 days 23 hrs 26 mins
	Item Condition: New Item Location: Woodridge, IL, USA ZIP 605** Shipping Type: Flat Rate Shipping Cost: $7.00 Handling Time: 2 business days Returns Accepted Seller: trustful777 Feedback: 1,724 / 99.8% See other items for sale from trustful777
Buy Now »	Krone Kristal Topaz Clear Transparent Acrylic Sterling Rollerball Pen.
	Details » Buy Now for $620.00 »	Buy: $620.00	Ships: $30.00	$650.00	4 days 23 hrs 29 mins
	Item Condition: Used Item Location: Maple Valley, WA, USA ZIP 980 Shipping Type: Flat Rate Shipping Cost: $30.00 Expedited Shipping Handling Time: 1 business day Seller: stylophiles Feedback: 487 / 100%** See other items for sale from stylophiles
Buy Now »	New Montblanc Meisterstuck Classique Gold Trim Rollerball Pen Top Pick
	Details » Buy Now for $385.71 »	Buy: $385.71	Ships: Free	$385.71	4 days 23 hrs 30 mins
	Item Condition: New Item Location: Des Moines, IA, USA ZIP 503** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: montblancoutlet Feedback: 272 / 98.7% Top-Rated Seller See other items for sale from montblancoutlet
Buy Now »	Gisi Pen Company Knights Templar Camelot Orange Limited Edition Rollerball Pen
	Details » Buy Now for $2,950.00 »	Buy: $2,950.00	Ships: $65.00	$3,015.00	4 days 23 hrs 31 mins
	Item Condition: New Item Location: Maple Valley, WA, USA ZIP 980 Shipping Type: Flat Rate Shipping Cost: $65.00 Expedited Shipping Handling Time: 1 business day Seller: stylophiles Feedback: 487 / 100%** See other items for sale from stylophiles
Buy Now »	Krone Cosmos Roswell Rollerball Special Edition Rollerball Pen
	Details » Buy Now for $650.00 »	Buy: $650.00	Ships: $25.00	$675.00	4 days 23 hrs 38 mins
	Item Condition: Used Item Location: Maple Valley, WA, USA ZIP 980 Shipping Type: Flat Rate Shipping Cost: $25.00 Expedited Shipping Handling Time: 1 business day Seller: stylophiles Feedback: 487 / 100%** See other items for sale from stylophiles
Buy Now »	Original James Wines “Fingerprints” Design Pen From Acme Pens 2002-2015
	Details » Buy Now for $325.00 »	Buy: $325.00	Ships: Based on Zip	$325.00 Plus shipping	4 days 23 hrs 40 mins
	Item Condition: New Item Location: Birmingham, MI, USA ZIP 480 Shipping Type: Calculated Handling Time: 3 business days Seller: judwei_36 Feedback: 53 / 100%** Top-Rated Seller See other items for sale from judwei_36
Buy Now »	Russ Meridien Rollerpoint no.16099 NEW
	Details » Buy Now for $69.00 »	Buy: $69.00	Ships: Based on Zip	$69.00 Plus shipping	4 days 23 hrs 41 mins
	Item Condition: New Item Location: Punta Gorda, FL, USA ZIP 339** Shipping Type: Calculated Handling Time: 2 business days Returns Accepted Seller: sunnypalmsresale Feedback: 415 / 98% Top-Rated Seller See other items for sale from sunnypalmsresale
Buy Now »	Parker Arrow Brushed Stainless Steel & Shiny Chrome Trim Twist Ball Point Pen
	Details » Buy Now for $16.95 »	Buy: $16.95	Ships: $6.50	$23.45	4 days 23 hrs 41 mins
	Item Condition: Used Item Location: Bayside, NY, USA ZIP 113** Shipping Type: Flat Rate Shipping Cost: $6.50 Handling Time: 1 business day Seller: srand18 Feedback: 3,684 / 99.7% See other items for sale from srand18
Buy Now »	SHEAFFER INTENSITY Ballpoint Pen White & CHROME NIB & Bosca Eel Skin Wallet New
	Details » Buy Now for $44.99 »	Buy: $44.99	Ships: Free	$44.99	4 days 23 hrs 47 mins
	Item Condition: New Item Location: Trumbauersville, PA, USA ZIP 189** Shipping Type: Local Pick-up Handling Time: 3 business days Seller: krystalscurios Feedback: 690 / 98.3% Top-Rated Seller See other items for sale from krystalscurios
Buy Now »	ACME Studio "Bacterio" Etched Roller Ball Pen by MEMPHIS Founder ETTORE SOTTSASS
	Details » Buy Now for $375.00 »	Buy: $375.00	Ships: $9.90	$384.90	4 days 23 hrs 49 mins
	Item Condition: New Item Location: West Hollywood, CA, USA ZIP 900** Shipping Type: Flat Rate Shipping Cost: $9.90 Handling Time: 5 business days Seller: design_mafia Feedback: 2,896 / 97.5% See other items for sale from design_mafia
Buy Now »	Omas Guglielmo Marconi Rollerball!
	Details » Buy Now for $750.00 »	Buy: $750.00	Ships: Based on Zip	$750.00 Plus shipping	4 days 23 hrs 50 mins
	Item Condition: Used Item Location: El Paso, TX, USA ZIP 799 Shipping Type: Calculated Handling Time: 3 business days Returns Accepted Seller: airlineinternational Feedback: 2,899 / 100%** Top-Rated Seller See other items for sale from airlineinternational
Buy Now »	Archived ACME Studio "Cybernetic" Roller Ball Pen by Artist LAURENCE GARTEL NEW
	Details » Buy Now for $225.00 »	Buy: $225.00	Ships: $9.90	$234.90	4 days 23 hrs 58 mins
	Item Condition: New Item Location: West Hollywood, CA, USA ZIP 900** Shipping Type: Flat Rate Shipping Cost: $9.90 Handling Time: 5 business days Seller: design_mafia Feedback: 2,896 / 97.5% See other items for sale from design_mafia
Buy Now »	Retro 1951 Tornado Rollerball Pen, Stainless Steel
	Details » Buy Now for $59.99 »	Buy: $59.99	Ships: Free	$59.99	4 days 23 hrs 59 mins
	Item Condition: Used Item Location: Peekskill, NY, USA ZIP 105** Shipping Type: Free Handling Time: 2 business days Seller: bluehippo90 Feedback: 1,824 / 99.2% Top-Rated Seller See other items for sale from bluehippo90
Buy Now »	ACME Studio “Linear" Rollerball Pen By MEMPHIS Designer MICHELE DE LUCCHI - NEW
	Details » Buy Now for $39.00 »	Buy: $39.00	Ships: $9.90	$48.90	5 days 1 min
	Item Condition: New Item Location: West Hollywood, CA, USA ZIP 900** Shipping Type: Flat Rate Shipping Cost: $9.90 Handling Time: 5 business days Seller: design_mafia Feedback: 2,896 / 97.5% See other items for sale from design_mafia
Buy Now »	Retro 51 Limited Edition Tornado Popper Dinosauria Rollerball Pen
	Details » Buy Now for $118.00 »	Buy: $118.00	Ships: Based on Zip	$118.00 Plus shipping	5 days 1 min
	Item Condition: New Item Location: El Paso, TX, USA ZIP 799 Shipping Type: Calculated Handling Time: 3 business days Returns Accepted Seller: airlineinternational Feedback: 2,899 / 100%** Top-Rated Seller See other items for sale from airlineinternational
Buy Now »	MONTBLANC Meisterstuck Around the World in 80 Days Doue Rollerball Pen 128482
	Details » Buy Now for $1,104.85 »	Buy: $1,104.85	Ships: Free	$1,104.85	5 days 4 mins
	Item Condition: New Item Location: Los Angeles, CA, USA ZIP 900** Shipping Type: Free Returns Accepted Seller: watchwarehouse Feedback: 19,739 / 97.3% Top-Rated Seller See other items for sale from watchwarehouse
Buy Now »	Parker Chrome Cap & Barrel Roller Ball Pen
	Details » Buy Now for $25.00 »	Buy: $25.00	Ships: $5.00	$30.00	5 days 7 mins
	Item Condition: Used Item Location: Sterling Heights, MI, USA ZIP 483** Shipping Type: Flat Rate Shipping Cost: $5.00 Handling Time: 1 business day Returns Accepted Seller: raedmandawi2012 Feedback: 11,196 / 99.5% See other items for sale from raedmandawi2012
Buy Now »	Retro 51 Vintage Flight I—Night Ed. Rollerball Pen—NEW—SEALED
	Details » Buy Now for $64.00 »	Buy: $64.00	Ships: Free	$64.00	5 days 12 mins
	Item Condition: New Item Location: Corpus Christi, TX, USA ZIP 784 Shipping Type: Free Handling Time: 1 business day Seller: jeen75jonn Feedback: 2,189 / 100%** Top-Rated Seller See other items for sale from jeen75jonn
Buy Now »	Levenger by Sheaffer Agean Green White Dot Rollerball Pen-gold trim-working
	Details » Buy Now for $162.75 »	Buy: $162.75	Ships: $13.00	$175.75	5 days 15 mins
	Item Condition: Used Item Location: Memphis, TN, USA ZIP 381** Shipping Type: Flat Rate Shipping Cost: $13.00 Handling Time: 1 business day Returns Accepted Seller: rgbpd1 Feedback: 33,279 / 99.6% Top-Rated Seller See other items for sale from rgbpd1
Buy Now »	Levenger by Sheaffer Red White Dot Rollerball Pen-gold trim-working
	Details » Buy Now for $162.75 »	Buy: $162.75	Ships: $13.00	$175.75	5 days 19 mins
	Item Condition: Used Item Location: Memphis, TN, USA ZIP 381** Shipping Type: Flat Rate Shipping Cost: $13.00 Handling Time: 1 business day Returns Accepted Seller: rgbpd1 Feedback: 33,279 / 99.6% Top-Rated Seller See other items for sale from rgbpd1
Buy Now »	Montegrappa Harry Potter: Ravenclaw Limited Edition Rollerball Collectible Pen
	Details » Buy Now for $365.00 »	Buy: $365.00	Ships: $15.00	$380.00	5 days 20 mins
	Item Condition: New Item Location: Warminster, PA, USA ZIP 189 Shipping Type: Flat Rate Shipping Cost: $15.00 Handling Time: 3 business days Seller: amzcollections Feedback: 309 / 100%** See other items for sale from amzcollections
Buy Now »	Levenger by Sheaffer Mediterarean Blue White Dot Rollerball Pen-gold trim-works
	Details » Buy Now for $162.75 »	Buy: $162.75	Ships: $13.00	$175.75	5 days 23 mins
	Item Condition: Used Item Location: Memphis, TN, USA ZIP 381** Shipping Type: Flat Rate Shipping Cost: $13.00 Handling Time: 1 business day Returns Accepted Seller: rgbpd1 Feedback: 33,279 / 99.6% Top-Rated Seller See other items for sale from rgbpd1
Buy Now »	New Montblanc Meisterstuck Classique Platinum Rollerball Pen wth Leather case
	Details » Buy Now for $351.08 »	Buy: $351.08	Ships: Free	$351.08	5 days 30 mins
	Item Condition: New Item Location: Des Moines, IA, USA ZIP 503** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: montblancoutlet Feedback: 272 / 98.7% Top-Rated Seller See other items for sale from montblancoutlet
Buy Now »	MONTEGRAPPA ROLLERBALL PEN BOX Only 2003 Paperwork & Warranty Card
	Details » Buy Now for $149.95 »	Buy: $149.95	Ships: Based on Zip	$149.95 Plus shipping	5 days 34 mins
	Item Condition: Used Item Location: Wilkes-Barre, PA, USA ZIP 187** Shipping Type: Calculated Handling Time: 1 business day Returns Accepted Seller: 73cj5 Feedback: 4,576 / 99.3% Top-Rated Seller See other items for sale from 73cj5
Buy Now »	Lamy Safari Rollerball - 4th of july - Special Edition - NEW in Box
	Details » Buy Now for $65.00 »	Buy: $65.00	Ships: Based on Zip	$65.00 Plus shipping	5 days 34 mins
	Item Condition: New Item Location: Los Angeles, CA, USA ZIP 900 Shipping Type: Calculated Handling Time: 3 business days Seller: architectscornerla Feedback: 30 / 100%** See other items for sale from architectscornerla
Buy Now »	Visconti Opera Master Antarctica Limited Edition Rollerball Pen
	Details » Buy Now for $850.00 »	Buy: $850.00	Ships: Based on Zip	$850.00 Plus shipping	5 days 45 mins
	Item Condition: New Item Location: El Paso, TX, USA ZIP 799 Shipping Type: Calculated Handling Time: 3 business days Returns Accepted Seller: airlineinternational Feedback: 2,899 / 100%** Top-Rated Seller See other items for sale from airlineinternational
Buy Now »	Montblanc Meisterstuck Classique Rollerball 163 12890 Lower Barrel Black/Gold
	Details » Buy Now for $95.00 »	Buy: $95.00	Ships: $4.95	$99.95	5 days 47 mins
	Item Condition: Used Item Location: Skokie, IL, USA ZIP 600** Shipping Type: Flat Rate Shipping Cost: $4.95 Handling Time: 2 business days Seller: nwfinejewelers Feedback: 24,046 / 99.4% Top-Rated Seller See other items for sale from nwfinejewelers
Buy Now »	ACME Studios' "Rochetti" Rollerball Pen by Renowned Artist E SOTTSASS
	Details » Buy Now for $210.00 »	Buy: $210.00	Ships: Free	$210.00	5 days 49 mins
	Item Condition: New Item Location: Houston, TX, USA ZIP 770** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: jaxpens Feedback: 2,201 / 99.4% See other items for sale from jaxpens
Buy Now »	ACME Studios' "Shaman" Rollerball Pen by Designer TIMO SARPANEVA
	Details » Buy Now for $297.50 »	Buy: $297.50	Ships: Free	$297.50	5 days 50 mins
	Item Condition: New Item Location: Houston, TX, USA ZIP 770** Shipping Type: Free Handling Time: 1 business day Returns Accepted Seller: jaxpens Feedback: 2,201 / 99.4% See other items for sale from jaxpens