Since 1967, Fisher Space Pens have been used on all manned American and Russian space flights: They write underwater, in extreme temperatures, and at any angle—even upside down and in zero gravity!— thanks to a specially customized ink cartridge. And on Earth? Well, they perform brilliantly down here, too. Measuring 5", this sleek, antimicrobial brass ballpoint pen writes in smooth black ink, opening and closing with just a push of a finger. It's an "out of this world" gift for the space nut or adventurous writer you know!