TWSBI ECO Onyx Fountain Pen | Cosmo Blue

TWSBI ECO Onyx Cosmo Blue is a fountain pen with a unique blue marbled cap and black Onyx finish. The transparent barrel allows you to monitor the ink level and admire the built-in piston filling system. Perfect for beginners, enthusiasts, and fountain pen collectors.

Why choose TWSBI ECO Onyx Cosmo Blue?

• Blue marbled cap: Unique Cosmo Blue pattern with black Onyx accents – elegant and modern design.
• Piston filling system: Fill directly from your favorite ink bottle – large capacity and freedom of choice.
• Transparent barrel: Full visibility of ink level and color without disassembling the pen.
• Stainless steel nib: Smooth and comfortable writing – available in EF, F, M, B, and Stub 1.1 sizes.
• Screw-on cap: Tight seal protects the nib from drying out.

Technical specifications

• Material: Resin, stainless steel
• Length of closed pen: 132 mm | barrel: 126 mm | with cap posted: 168 mm
• Diameter: 13 mm
• Nib: Steel (EF, F, M, B, Stub 1.1)
• Filling system: Piston
• Color: Cosmo Blue (blue marbled cap) with black Onyx finish
• Country of production: Taiwan

Responsible entity: Escribo, ul. Plebiscytowa 17, 40-035 Katowice | info@escribo.pl