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- Regular price
- $49.99
- Sale price
- $49.99
- Regular price
-
- Unit price
- / per
The ECO is the most affordable model yet from TWSBI. This pen features a piston mechanism, a clear barrel, clear cap and piston knob. The nib is smooth with a little feedback. The barrel is clear and smooth, which has lesser grip than a typical pen. Overall, it feels great holding in hand.
- Body Color: Brown w/ Bronze Trim
- Body Material: Resin
- Cap Type: Screw-cap
- Compatible inks & refills: Bottled inks
- Filling Mechanism: Piston
- Nib Material: Steel
- Diameter: 0.5"
- Length: 5.2"
- Max Ink Capacity: 1.76ml
- Release Date: February 13, 2025
View all TWSBI products
About TWSBI:
TWSBI 三文堂 (San Wen Tong) is one of our earliest collection even before the store. TWSBI started as an OEM manufacturer for different western brands, and around 2009, they decided to start their own brand. With 50 years of experience in pen making, they took to fountain pen forums and gather users’ feedback. It was said that Pelican M800 was the model they were inspired. Most of their pens are transparent, so it’s really fun to see the ink color and it lasts for a very long time.
The name 三文堂 (San Wen Tong) comes from the Hall of the Three Rare Treasures, created by Emperor Qianlong as a memorial to three great masterpieces of Chinese calligraphy. The initials of the name “San Wen Tong” was reversed and thus turned into "TWS". The last letters "Bi" was added with its literal meaning of "writing instruments" in Chinese. Thus combining the two segments, creating TWSBI.






I bought this TWSBI because I really enjoy using the brand and having a pen with such a large ink capacity. I wanted this beautiful new color to add to my collection, and I had previously purchased an EF nib I enjoyed. However, this nib out the box was kind of a nightmare. It didn't write well, and it was scratchy on paper meant for Fountain pens. I ultimately had to make some adjustments (at the risks of almost completely ruining the nib). However, I think it's okay now, but the nib no longer feels EF.
I love the eco this is my 4th one! Yoseka has fast delivery and I am very pleased with my order 🥰
Very beautiful in person and the medium nib is very smooth to write with
My first TWSBI and I love it! Thanks so much Team Yoseka! 🫶🏾