TWSBI Eco Fountain Pen with glow in the dark (yes, really) green cap and barrel end. Clear 'demonstrator' barrel reveals the filling mechanism, a built-in piston-filler with a very smooth action. Chromed metal trim and pocket clip. TWSBI logo nicely finishes the top of the pen's cap. Rubber O-ring on cap thread ensures an airtight seal to prevent ink drying out in the pen, whilst also ensuring that the cap is firmly attached to the pen when not in use.
Faceted cap ensures pen will not roll away if left on a desk. Polished steel nib engraved with TWSBI logo and branding, available in two nib sizes.
Note: piston-filler pens cannot use cartridges.