TWSBI ECO Carrara White and Onyx Fountain Pen Fine Nib (F)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 white cap and finial. The pen cap has an inner cap to ensure a perfect seal when stored away. It is completed with onyx black PVD trim and a matching stainless steel nib. The Carrara color features a new coloring technique