Jt 90g Co2 Cylinder Cartridge - Crosman 88g Airsource - 90 88 Gram with Adapter for Paintball Guns - 5 Pack 90gram Prefilled CO2 Tank Single Use Tank. Not refillable. Standard use in most paintball markers Must be used in conjuction with the JT 90 gram CO2 adaptor - 1 INCLUDED 5 pack of tanks