Pen Used by NASA since 1967, the ultimate in writing tools, this is the only pen that works in the freezing cold (-34°), extreme heat (+134°), and the gravity-free vacuum of space. The sealed, pressurized ink cartridge has an average writing distance of approx. 20 miles, enough to last the average person over 80 years. The solid gel ink allows the pen to write over most grease and water. Used and tested by the American and Russian space programs, this pen is built to last. Comes gift boxed, with black ink and measures 5”.