The TWSBI Mini Fountain Pen comes with a benchmark piston ink-filling mechanism and has all detachable parts. It features a Black and clear pen with a steel nib. Polished steel nib engraved with TWSBI logo and branding. This TWSBI fountain pen is a compact fountain pen and has the capability to hold more ink than most small pens. The clear diamond-faceted barrel has a built-in piston filler that allows you for an uninterrupted view of the ink. The fountain pen price is affordable. You will find a range of affordable fountain pens at William Penn.