Wellshot 12g CO2 cartridges are pure, precise and provides high discharge rate. Compatible with all CO2 pistols and revolvers. These 12g CO2 cartridges are fit for the function they were designed for, which is to propel BBs or air pellets from any CO2 gun. Experience more shots with high discharge rate. Wellshot 12g CO2 cartridges comes in 5 pack, 15 pack and 45 pack.