A 12 gram CO2 cartridge, known commercially as a Powerlet, contains 12 grams of CO2 in a liquid/gas equilibrium. The cartridge is made of thick steel with a thin welded cap. When the cap is pierced, the CO2 rapidly expands. Cartridges can be purchased in bulk for around fifty cents each. These cartridges offer a portable, convenient method of pressurizing a pneumatic cannon. Because CO2 operates at extreme pressures, these cartridges must be treated with appropriate caution.
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