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Set of six (6) nine item genuine sealed packs of the Fisher Space Pen Fine Point Universal Su1 F Blue Refills. Paul Fisher Pressurized Refill developed for NASA in 1965. They are still in use today on human spaceflight as it performs when other pens fail. The combination of the tungsten carbide ball and ink in a hermetically sealed thixotropic cartridge pressurized to nearly 15.9 kilograms per square inch allows this one to write in the freezing cold, heat of water boiling, under water and at any angle, even upside down.