CO2 Cartridge CO2 Cartridge is designed for bicycle inflating, 16 gram a small piece for one tire used, it's easy and simple to operation, don't forget to keep a pair for your bicycle for prevention.  Product Packaging Delivery MOQ Payment FOB Port CO2 Cartridge16*30pcs/ctn30 days10,000 PCST/T, WU, L/CGuangzhou, Shenzhen, HK CO2 Cartridge is designed for bicycle inflating, 16 gram a small piece for one tire used, it's easy and simple to operation, don't forget to keep a pair for your bicycle for prevention. Different sizes are available for your choice.