List Price: $22.00 Deal Price: $16.69 You Save: $5.31 (24%)When closed, the Bullet Space Pen is 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 patented ink cartridge was designed by Paul Fisher for NASA in the 1960's enabling it to write in temperatures from -30 to +250 degrees Fahrenheit, under water, in zero gravity, at any angle, even upside down.Expires Feb 4, 2011