Great quality CO2 runs clean in your airguns. These Walther manufactured cartridges come two per pack. Each 88g cylinder of pure CO2 provides longer shooting sessions. It is recommend that operators use all CO2 each session so there is no pressure left on the seals of the airgun for more than a day. It is also good practice to put a drop of silicone oil, like RWS Chamber Lube, on the tip of the capsule before inserting it in order to keep seal lubricated and the internals of your pellet rifle in good working condition. 88 grams Pure CO2 Non-threaded tip Secure seal 22 pack Fits air rifles such as the Umarex AirJavelin, Fusion 2, 850 Air Magnum, and 850M2.