Paul Fisher created the pressurized refill its Fisher Space Pen more than 40 years ago,
All the Fisher Space Pen refills in fact allow you to write:
-With the tip pointing upwards
-Under water and under water
-On grease and greasy
-Extreme temperatures (-35°/+ 120°)
-About 15 times more than a normal refill
the refil of Fisher can be adapted on all pens that mount the standard spare Parker.