Famously used by astronauts since the Apollo missions of the 1960s and 70s, Fisher Space Pens have captured imaginations with their amazing ink that can write virtually anywhereupside-down, underwater, over grease, and in extreme hot and cold temperatures. Writes in extreme temperatures from -30F to 250F Precision assembled, hand tested Simply the most versatile pen ever made Writes at any angle, even in Zero Gravity Case is raw unfinished brass