The lezyne trigger speed drive cnc machined aluminum dispenser with brass internals trigger valve operation allows for easy and controlled inflation slip fit head presses onto presta valves only neoprene sleeve insulates hand from cold during discharge compatible with threaded co2 cartridges comes with one 16g cartridge lezyne trigger speed drive features compatable with threaded co2 cartridges neoprene sleeve insulates hand from cold during discharge weight 26g