FISHER SPACE PEN REFILLS
APEX's brass ink cartridge is none other than the patented Fisher Space Pen refill (Medium Black PR4). Nitrogen-pressurized and sealed, with a tungsten carbide ball and stainless steel point, the Fisher cartridge can write in zero gravity, underwater, upside down, over wet and greasy paper, at any angle, and from -30 °F to 250 °F!
We chose the Fisher Space Cartridge as our exclusive ink refill because it’s simply the best and most reliable one ever made. NASA, armed forces, public safety, and outdoor enthusiasts depend on Fisher’s durability, versatility, and thixotropic ink, which writes three times longer than an ordinary ballpoint.
PR refills come in a variety of point sizes and colors. Choose the one that best fits your lifestyle from the options below:
*Note: All fine point refills will come in nickel-silver instead of brass cartridges. Also please note that the product number PR4 and SPR4 are used for the same refill (Black Medium) the only difference is just in the retail packaging/blister card.
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