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Fisher Medium Point Space Pen Refill

The Fisher Medium Point Space Pen Refill writes upside down and underwater, in zero gravity and at altitudes of 12,000 feet, and in extreme heat and cold. It's also guaranteed to write on almost any smooth surface, whether wet or greasy, on coated paper or photographs or x-rays. The thixotropic ink in the pressurized reservoir writes three times longer than your standard ballpoint, making it a go-to choice for alpinists and divers, paramedics, construction workers, and military. This Fisher Medium Point Space Pen Refill is available in black, red, and blue ink and will fit in any of the Fisher Space Pens: Astronaut Space Pen, X-750 and all Bullet Space Pens.

  • Available in Black, Red or Blue Ink
  • Compatible w/ Fisher Astronaut Space Pen, X-750 & Bullet Space Pens
  • Item #: pfpwc2115

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Fisher Medium Point Space Pen Refill

Fisher Medium Point Space Pen Refill

Pen Style

Point Size
Medium Point

Pen Refill

Refill Type



In the 1950's there were dozens of ballpoint models, and nearly every one took a different refill. So in 1953 Paul Fisher invented the "Universal Refill," which could be used in most pens. But he didn't stop there. After much experimentation he perfected the refill using thixotropic ink; the trick was to have the ink flow when you wanted it to, and not to flow the rest of the time, a problem Fisher solved.

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