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Fisher PR Series Pressurized Replacement Cartridges. Fisher Space Pen's Sealed Pressurized Ink Cartridge performs in temperatures from -30°F to +250°F, underwater, in zero gravity, at any angle-even upside down! The ultimate in dependability! The choice of ski patrols, search and rescue teams, law enforcement agencies, armed forces, and everyone who demands reliability in a writing instrument.

ALL PR refills come with a plastic adapter which allows them to be used in Parker Style Pens!

Fisher PR Series Pressurized Replacement Cartridge Features:

• Fits ALL Fisher Space Pens (except the Q4)
• Standard 3 1/2" Pressurized Refill
• Write Out for this Refill is approximately 15,000 feet
• Lasts 3 ½ times longer than a typical ball point refill
• Available ink colors: Black & Blue

Fisher PR Series Cartridge Writing Points:

• Fine - .9mm Ball
• Medium - 1.1mm Ball
• Bold - 1.3mm Ball