Short and sweet! A slight twist of the solid copper bullet and you have a ball point pen. Twist again and you merely have a .250 cal. Savage rifle cartridge. This interesting high velocity pen features a replaceable Lamy ink cartridge, precision threaded assembly, positive twist stops, blue ink in fine or medium, and a pocket or key ring option. This is a great unique gift idea. (All of the brass and copper parts are machined from solid bar stock).