This is the PR4- Black Ink Medium Point Space Pen Pressurized Cartridge from Fisher.
It is a 3.5 inch cartridge, and will work on any of the Fisher Space Pens that we have carried at Shop Geocaching.
Please note: This is a replacement cartridge. Pens are sold separately.
Keep your Space Pen® writing!
This is a replacement cartridge for all styles of the Fisher Space Pens that we have carried. It is a standard 3.5 inch cartridge with blank ink.
This replacement will last 3.5 times longer than the typical ball point pen!