Each 24kt finish Bolt Action Bullet pen is individually hand-crafted and assembled in our studio. The rich grain of Koa wood shimmers, each piece is unique, therefore each pen is unique. These pens are hand finished, polished and buffed to a nice gloss for years of durability. Parker (TM) ink cartridge refills are available at any office supply store. This pen is available in the following finishes (hardware) Gun Metal; 24kt Gold (shown); Black Enamel (looks great made with camouflage acrylic!); Antique Brass; Antique Copper; Antique Pewter. Any type of wood or acrylic available for the body of the pen.