Fisher Space Pen Cap-O-Matic Space Pen with Laser Engraved US Army Insignia, Matte Black (M4BAR) Officially Licensed by the U.S. Army. This Matte Black cap-o-matic space pen, with laser Engraved US Army insignia. Writes upside down - at any angle, under water, through grease, in extreme temperatures (-30 to +250 degrees F), on almost any surface, three times longer than the average pen. Our refills are hermetically sealed, pressurized with nitrogen gas, and feature a tungsten carbide Ballpoint tip - the same extra hard metal that is used to make armor-piercing ammunition. The Fisher Space Pen is precision assembled in the USA, hand tested, and carries a lifetime guarantee against all manufacturing defects. Overall length: 5.375"