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What makes it "CAL .45"? or is just another case of "All Your Bases Are Belong To Us" + desperate attempt to be TactiCool?
Caliber is a unit of measurement, most commonly used for firearms. These are bolt pens, reminiscent of the way cartridges are loaded and locked into rifle barrels, with approximate diameter of what would be called ".45 caliber" if it was a gun barrel.
For more info: https://en.wikipedia.org/wiki/Caliber
It's called that because this pen is as wide in diameter as a .45 cartridge.