This Fisher Space Pen Refill is a pressurized cartridge that produces black ink. It is compatible with most of the of Fisher Space Pens including the Bullet and Shuttle models. The refill is made of brass and is designed to fit securely in the pen. This item is perfect for those who need a replacement refill. It is made in the USA and is a high-quality product. The pressurized refill ensures that the ink flows smoothly and writes Upside down, Under Water and at temperatures from 250 to -30 degrees Fahrenheit (121 to -35 Centigrade)
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