TWSBI - Eco Fountain Pen | Cosmo with Onyx Trim

 The TWSBI ECO fountain pen boasts an incredible value with its piston filling system and affordable price. Like many other TWSBI fountain pens, it features a crystal clear acrylic barrel so you can see your ink level, and a marbled Blue cap and finial. The pen cap has an inner cap to ensure a perfect seal when stored away. It is completed with onyx PVD trim and a matching stainless steel nib.