The Lezyne Trigger Speed Drive CO2 is a CNC machined Aluminium dispenser with brass internals. The trigger valve operation allows for easy & controlled inflation & fits Presta valves only. Coming supplied with a Neoprene sleeve which fits snug around the cartridge, this insulates your hand from the cold during the discharge. The Trigger Speed Drive is compatible with threaded Co 2 cartridges only. Coming supplied with one cartridge you can use this as soon as you get it.