The Prestacycle Micro CO2 inflation head utilizes an ultra compact and lightweight design that provides a secure, leak free connection with incredible inflation control. Features: Ultra compact and lightweight CO2 inflation head Head is threaded so no air is lost when connected to valves Air flow is controlled by the CO2 cartridge. Simply thread on the cartridge to head and control air flow by unthreading the cartridge slowly. Cartridge can be tightened again to save leftover CO2 Compatible with both Presta and Schrader heads Includes foam sleeve for CO2 cartridges Weights only 12g