The Fisher Universal Pressurized Cartridges are designed to fit only Multi-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 - SU1F Fisher Universal Cartridge - Blue Ink - Fine Point Features: