Discover premium design and mechanics with the TWSBI ECO Plum with Onyx Fountain Pen, crafted for enthusiasts and daily writers alike. With its transparent acrylic body showcasing your ink level and a rich plum cap paired with onyx-black accents, this pen stands out visually while delivering high-performance writing.
Ideal for those who value both form and function, it features a built-in piston filling mechanism—no cartridges required—offering up to 1.75 ml ink capacity for sustained writing. The pen comes in nib sizes Extra Fine (EF), Fine (F), Medium (M), Broad (B), and Stub 1.1 mm, providing flexibility for everything from precise note-taking to expressive signatures.
Choose from two elegant color-ways — White/Clear or Black/Clear — that pair the clear demonstrator barrel with contrasting cap and trim, making it both a functional tool and a statement piece.

Whether you’re journaling, drafting, or simply writing daily, this pen delivers smooth flow, visible mechanics, and refined aesthetics—all backed by a brand known for value and reliability.

Specifications

Why Choose TWSBI ECO Plum with Onyx Fountain Pen ?

• Exceptional Value: Offers high-end piston-filler mechanics at a more affordable price compared to many luxury brands.
• Transparent Barrel: A clear body allows you to monitor ink levels and admire the internal mechanism—ideal for fountain pen lovers.
• Flexible Nib Options: From EF to Stub 1.1 mm, you can choose the writing style that suits your personality and purpose.
• Stylish Aesthetic: The plum and onyx color combination gives it a distinctive look while remaining professional and versatile.
• Reliable Build: With a sturdy construction and generous ink capacity, it’s designed to handle daily use with ease.