Fisher Space Pen Ink Refill for Multi-Action Pen - Blue

Blue Ink Fine Point.

This is the replacement Cartridge for the Multi-Action Space Pen. Fisher Space Pens write reliably under extreme conditions: over fingerprints, extreme cold -50°C, extreme heat +200°C, over wet paper , in a vacuum, upside down.

The PR and SU Cartridge are NOT INTERCHANGEABLE! SU Cartridges contain a much smaller amount of ink, they write about 1200 feet depending on your writing style.