The Fisher Universal Pressurized Cartridgesare designed to fit onlyMulti-Action Ballpoint Pens like (TAN, TAN-S, G4, Q4 etc). These refills will not fit Sensa Pens. Please select the regular Fisher or Sensa Ballpoint for those pens. The Fisher universal refill comes in blue, black and red.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 - SU4F Fisher Universal Cartridge - Black Ink - Fine PointFeatures:

• Fisher Universal Series Pressurized Cartridge Refill
• Writes Upside Down & Underwater
• Brass & Steel Construction
• Color: Black Ink
• Point: Fine Point
• Blister Card Packaging