Walther 12G CO2 Cartridge 10 Packs by Umarex Walther 12G CO2 Cartridge Manufactured by Umarex Perfect for Walther, Umarex, Beretta, S&W, Colt, H&K and Makarov Air Pistols Seamless fit in paintball pistols of Walther P99, RAM Desert Eagle, and RAM X50. 10 ct Authentic products in loose fill packaging.