Umarex 12 Gram CO2 (30 Cartridges)

12-gram CO2 cartridges 30ct Originally branded as Walther (a brand imported by Umarex) Specially made with close attention to tight tolerances, the Umarex 12-gram CO2 cartridges have uniform neck dimensions. That makes it more likely that every cartridge will pierce properly and gas will be evenly dispersed into your air gun.