• SEALED PRESSURIZED INK REFILL • Refill tip is Ultra-hard Tungsten Carbide Ball, Stainless steel precision socket prevents leaking yet delivers uniform ink flow. • Writes underwater, upside down, at any angle,extreme temperatures from – 30º F (-35º C) to +250º F (121º C), over grease, 3 times longer than the average pen, etc. • Compartible with all standard Fisher cartridges. • Bullet Grips have rubber finger grip. • Comes with attractive gift box. • When closed, Bullet 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. • The original Bullet Space Pen was conceived in July of 1948, Paul Fisher was soon machining a new pen design shaped from solid aluminum. • It became our first Fisher ball point pen, the 400 Bullet Pen, and arguably the most popular pen of the twentieth century. • This pen is now all brass with a blue lacquer finish. • Cited as an outstanding example of industrial art, the classic design of the Fisher Bullet Pen has been exhibited for years in the New York Museum of Modern Art. • The Bullet's timeless styling has been the topic of many art books and magazine articles. • Often imitated, but never duplicated, the Fisher Bullet continues to be our most popular pen.