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16 Grams CO2 Cartridge. Recommended for the Quick Shot and the Pro Launcher.
Note: CO2 Cartridges are made in a variety of gram sizes including, 8 grams, 16 grams, 25 grams, and 38 grams. In general, the higher the gram count, the greater the force. Norcostco only stocks the 16 gram cartridges.