TWSBI Eco Cosmos Blue with Onyx Fountain pen

The TWSBI Eco Cosmos Blue with Onyx Fountain Pen blends affordability, durability, and elegant design in one sleek writing instrument. Featuring a Cosmos Blue cap and piston knob paired with onyx black metal accents, this pen delivers a modern aesthetic that stands out on any desk.

With its clear barrel, you can easily view the ink level and internal piston-filling system—offering both function and visual appeal. The polished stainless steel nib, engraved with the TWSBI logo, ensures a smooth, consistent writing experience, available in multiple nib sizes to suit your style.

Designed for convenience and longevity, the Eco can be fully disassembled for cleaning and maintenance, with tools and instructions included.

Enjoy premium performance without the premium price. The TWSBI Eco Cosmos Blue with Onyx is the perfect everyday fountain pen for beginners, enthusiasts, and collectors alike.

With a history of more than 40 years of manufacturing, including producing high-end pens for other brands, Ta Shin Precision decided to start selling under their own brand, TWSBI. The name TWSBI is made up from TWS and BI. ‘TWS’ is the reversed initials of the phrase ‘San Wen Tong’, translated Hall of Three Cultures, and ‘BI’ literally means writing instrument.