TWSBI ECO Fountain Pen – Cosmos Blue Onyx

A stunning fusion of engineering and artistry, the TWSBI ECO Cosmos Blue Onyx is designed for writers who demand performance, beauty, and everyday reliability. Inspired by the mystique of deep space, this edition features a mesmerizing blue-onyx resin body with transparent elements that reveal the precision-crafted piston mechanism inside — a signature TWSBI hallmark.

Smooth, balanced, and built for serious writing, the ECO delivers an effortless ink flow and exceptional comfort, making it the perfect companion for journaling, note-taking, signatures, or gifting.

Why You’ll Love It

• Striking Cosmos Blue Onyx limited colour edition

• Reliable piston-filling mechanism — holds more ink than cartridge pens

• Crystal-clear barrel accents to showcase the ink reservoir

• Stainless steel nib (available in a range of sizes) for smooth, consistent writing

• Lightweight yet sturdy — perfect for daily carry

• Secure, snap-fit cap to prevent ink dry-out

• Designed for easy disassembly & cleaning

• Exceptional value from one of the world’s most trusted writing brands

Specifications

• Brand: TWSBI

• Model: ECO – Cosmos Blue Onyx

• Nib Material: Stainless Steel

• Filling System: Piston Filler

• Body Material: Resin with transparent components

• Cap Type: Screw-on

• Ink Capacity: High-capacity piston reservoir

• Packaging: Premium TWSBI gift box with wrench & silicone grease

Ideal For

• Students & professionals

• Fountain pen beginners upgrading to a serious writer

• Long writing sessions

• Everyday journaling

• Gifting to pen lovers

• Collectors of special-colour TWSBI editions
  
  Buy your TWSBI Eco Cosmos Blue Onyx Fountain Pen from Makoba!