Fisher Space Pen's Pressurized Ink Cartridge delivers unmatched reliability in extreme conditions, functioning flawlessly from -30°F to +250°F, underwater, in zero gravity, and at any angle—even inverted! This exceptional SU4F Universal refill guarantees performance when you need it most. Specifically designed for the Q4 Multi-Action Space Pen and compatible mini or multi-point pens, it's the dependable writing solution for any situation life throws your way.
