The LA Innovations 88g CO2 Cartridges are the best CO2 around. It consists of 100% pure CO2 with M16 x 1.5 threading for airsoft and airguns. For airsoft, one can expect 1800+ shots with an HPA rifle and 1000+ shots with an HPA pistol at 100 PSI. CO2 Details: - 100% Pure CO2 - M16 x 1.5 threading - Protective end cap