There are numerous astronauts who have used the Fisher Bullet Space Pen in the great unknown. The Fisher Bullet has been on every American and Russian space mission since the mid-sixties. This Special Edition 50th Anniversary Bullet Space Pen writes upside down, under water, through grease, and in the zero-gravity vacuum of outer space. Bullet Space Pens engrave beautifully. Order extra pressurized refills, also available in a wide range of colors and point sizes. A gold pocket clip is included with this Special Edition.