The Fisher Pressurized Refills is the Fisher standard 3 1/2 inch Pressurized Cartridge that fits most of the Fisher Space Pens.The Write Out for this Cartridge is approximately 15,000 feet depending on writing style - 3 ½ times longer than a typical ball point Cartridge.Designed for NASA space missionsthis unique pressurized refill write upside down, under water, in gravity free space, over glossy surfaces and in extreme temperatures.

Fisher Space Pen - Refills - SPR8 Pressurized Cartridge - Brown Ink - Medium PointFeatures:

• PR Series Pressurized Cartridge Refill
• Writes Upside Down & Underwater
• Brass & Steel Construction
• Includes: Parker Adapter
• Color: Brown Ink
• Point: Medium Point
• Blister Card Packaging