Powerlet

A Powerlet cartridge is a small disposable metal container holding 12 grams (0.42 oz) of compressed CO2 and often a small quantity of oil, used as a power source for certain air guns, airsoft guns, paintball guns, and for quick inflation of sundry devices, such as a personal flotation device. Originally developed and the trademark owned by Crosman Corporation and introduced to the market in 1954, the Powerlet CO2 cartridge has become the dominant source of power for inexpensive, rapid fire air guns from many manufacturers.