Umarex 88g CO2 is the ideal power source for Umarex Airguns and other air pistols and air rifles that shoot pellets, BBs, rubberballs or paintballs. Air pistols like the Walther P99 RAM (Real Action Marker) paintball gun and air rifles like the Beretta CX4 Storm and Hammerli 850M2 perform at their best when using Umarex CO2. NOTE: CO2 can not be shipped by air services. We will only ship CO2 by regular ground delivery. We can not ship CO2 cylinders to Hawaii.