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TWSBI ECO Fountain Pen - Carrara Onyx Trim
TWSBI

TWSBI ECO Fountain Pen - Carrara Onyx Trim

3 reviews
Regular price
$59.00
Sale price
$59.00
Regular price
Unit price
/  per 
1 Item in Stock
 
 

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, and has lesser grip than a typical pen. Overall, it feels great held in the hand.

  • Body Color: Carrara (Marble)
  • 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: September 26th, 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.

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Customer Reviews

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D
Damaris Perez
A very juicy writer!

I ordered a fine nib for this Twsbi. I've never used an onyx nib on one of these so when I wrote with it, I was surprised at the amount of ink it put down. Shows ink shading really well without going up a nib size.

D
Denorah Lang
Beautiful

I love TWSBI fountain pens so when I saw this pen I had to have it. The marble look on this one is beautiful. I love it!

K
Kelsey S.
Perfect addition to my little collection!

I got into FP's over the summer and fell in love with the look and feel of TWSBI's especially for the price point. I wanted to eventually add a 1.1 stub nib to my collection. As soon as I saw the stunning and swirling colors in the Carrera with the Onyx nib I knew it was "the one." I love the volume of ink my TWSBI's hold and that. you can see the inks swirling around. As someone who loves mechanical things seeing the inner workings and piston is really fun too. Your videos on TWSBI assembly, troubleshooting, and filling were really helpful when I got my first pens. <3 Thank You!

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