Fisher Space Pen Refill Medium Ball Point Black

The Fisher Space Pens use the standard Fisher “SPR Series” Refills. This refill was developed for NASA and has been used on EVERY Space Shuttle mission both American and Russian. They are hermetically sealed with a specially formulated thixotropic ink and pressurized to about 35 PSI. They are the only refills that will write at any angle because they do not rely on gravity, and have a shelf life of 100 years. Each refills also come with an adapter so they will fit Parker and Parker style Pens.

Fisher Space Pen Black Medium Ball Point Refill - #SPR4
Fits following pens: Bullet, Astronaut, Unique, Space-Tec, Military, Zero Gravity, Futura, Cap-O-Matic
Writes... Upside Down, Underwater!!!