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Quick inflation: these CO2 cartridges with 16G CO2 compressed gas inside. Easy to use, can simply inflate the bicycle tyres in seconds. A must have for cycling enthusiasts. Compact and comfortable: the length of these CO2 bicycle pump cartridges is only 8 cm, small and lightweight, can easily fit in your backpack, bag. You can take it with you when you go out. Easy to carry: the length of these CO2 bicycle pump cartridges is only 8 cm, small and lightweight, can easily fit in your backpack, bag. You can take it with you when you go out. Further compatibility: the CO2 cartridges with 3/8 thread head, can be used for CO2 inflator and CO2 bicycle pump.