Smithsonian Bullet Space Pen with Space Shuttle Emblem Still the One and Only Since its development in 1948, the space pen is still the only one that can write in extreme heat or cold, under water, over most grease and at any angle One of the original pens can be found in our National Air &amp; Space Museum collection We offer the latest version of this Bullet Space Pen with Space Shuttle Emblem in brass with matte black finish Replaceable with medium-point SPR4 pressurized ink cartridge