8 Gram CO2 Air Gun Cylinders Cartridges 5 Pack - Tophatter's Guns'N'Weapons Store - FREE SHIPPINGWhile most modern air guns use 12g or 88g cylinders, there are some air guns that still use 8g cylinders. Compressed CO2 quality is important for the health of your air gun. Naturally, Umarex manufacturers the best CO2 cylinders for your Umarex air guns to keep them running clean. Ensure the life of your Umarex, or other manufacturers air guns, with high quality CO2 cylinders. Features: 5x 8 Gram CO2 Cartridges Umarex CO2 Capsules fit in Most Air Guns