Refill PR4 ink cartidge for Fisher Space Pen®
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This Fisher Space Pen® features the PR4 ink cartridge with Black Ink and a Medium Point.
With Space Pen® technology, this pen can hang upside down forever yet function immediately when needed. Perfect for logging caches in any weather conditions, the sealed, pressurized ink cartridge writes underwater, upside down, at any angle and in temperatures from -30 degrees C to 121 degrees C. It lasts 3 times longer than the average pen, is environmentally friendly, unconditionally guaranteed and made in the USA.