12 Oz. High quality lightweight Aluminum Co2 tank with standard pin valve. DOT and TC Certified. Both cylinder and valve meet or exceed ASTM standards. These tanks have a 5 year re-hydro date. Each comes with a Safety Burst disc, pressure release. Approximately 500-700 shots per fill, but varies depending on gun, paintballs used, velocity, and outside temperature. These tanks do NOT come already filled, just like any store, but we can fill them here.