The Fisher pocket Tech space pen is made of anodized Aerospace-Grade 6061-T6 Billet aluminum and features a black finger grip & trim. The internal pressurized refill has a 100 year shelf life, and writes in extreme temperatures (-30 Degree to 205 Degree). when closed, pocket Tech space pens are the perfect size to carry in your wallet, pocket, purse, car glove box, organizer or toolbox. When open it's a full sized, evenly balanced writing instrument.