TWSBI ECO Caffe Bronze Fountain Pen Fine Nib (F)Twsbi Eco Caffe & Bronze features a demonstrator body with coffee brown cap and piston knob with bronze trim. The fountain pen is equipped with a steel nib and fills ink via a piston filler mechanism. Piston Filler Fountain pen. Simply unscrew the end cap, dip into ink, screw back the end cap, and your done! Ready to write!! Pen cap has an inner cap to insure a perfect seal when stored away. Made for the beginner who just wants to try out fountain