TWSBI Eco Pink Limited Edition Fountain Pen Fine Nib (F)TWSBI fountain pens are loved for their high quality and affordability, offering advanced filling mechanisms normally reserved for much more expensive fountain pens. The TWSBI ECO (short for "economical") provides the same high quality, high capacity piston filler as the TWSBI Diamond 580 at an even lower price. It features a sleek, transparent barrel and a hexagonal screw on cap that can be posted securely on the back of the pen. The piston filling