TWSBI Eco Fountain Pen

The TWSBI Eco Fountain Pen is a piston-filling fountain pen that brings a satisfying, hands-on feel to everyday writing. With a built-in filling system right in the barrel, it holds an impressive 1.75 ml of ink—nearly double the capacity of a standard converter pen—so you can write longer and refill less. To fill it, just twist the knob, dip the nib, twist again, and you're ready to go. The cap posts securely and seals tightly to keep your ink fresh between uses.

Inside the carrying case, you'll find:

• TWSBI Eco Fountain Pen
• vial of silicone grease for lubricating the piston mechanism and feed threads
• plastic wrench to safely disassemble the pen's piston mechanism for deep cleaning and maintenance

Note that this pen does not come pre-loaded with ink. Ink must be purchased separately. 

When you're ready for a refill, shop your favorite bottled ink in our fountain pen collection. 

Materials: acrylic resin, stainless steel

Made by: TWSBI

Made in: Taiwan

Specifications: 

• 5.5" closed
• 6.5" open
• choose 0.35mm fine or 0.5mm medium nib 
• built-in piston-filling mechanism

Use: 

• Unscrew the piston knob (twist counterclockwise) to lower the piston.
• Submerge the nib fully into a bottle of fountain pen ink.
• Twist the piston knob clockwise to draw ink into the barrel.
• Wipe off excess ink from the nib with a cloth or tissue.
• Recap the pen—you’re ready to write.

Care: When refilling or changing the nib and feed of the TWSBI Eco, air may enter the barrel and cause ink to leak. To prevent this, fully seat the nib and feed, then wipe away excess ink to restore pressure balance and ensure smooth writing.

Further Reading: TWSBI’s name is derived from the phrase San Wen Tong, a tribute to language, culture, and classical calligraphy. Their fountain pens reflect a mission to rekindle the romance of writing through quality, thoughtful design, and everyday usability.