AiraceUSA Bike Micro CO2 Pump Inflator, Reversible Presta and Schrader Air Valves with CO2 Cartridge Sleeve - AI-AC-03 Airace CO2 pump is a compact and ultralight User-friendly design for the air release by twisting the cartridges A detachable CO2 cartridge sleeve for easy grip & protection Can be used interchangeably between Presta and Schrader air valves. Note: CO2 cartridge is not included.