Sealed pressurized cartridge that fits almost all Fisher Space pens. If performs in temperatures from 0 to +120 ℃, underwater, in zero gravity, at any angle–even upside down! The write out for this cartridge is approximately 3500 meters depending on writing style - over three times longer than a typical ball point cartridge. Comes with a plastic adapter which allows the refill to be used in Parker style pens as well.

Point sizes: Fine 0,9 mm, Medium 1,1 mm, Bold 1,3 mm

1. Gas plug
2. Sliding float separates ink from pressurized nitrogen gas
3. Thixotropic ink in a hermetically sealed, pressurized reservoir writes three times longer than an ordinary ballpoint
4. Ultra-hard tungsten carbide ball