The lezyne trigger drive with cartridge cnc machined aluminum dispenser with brass internals trigger valve operation for easy and controlled inflation twin chuck head threads on to presta and schrader valves neoprene sleeve insulates hand from cold during discharge compatible with threaded co2 cartridges comes with one 16g cartridge lezyne trigger drive with cartridge features weight 26g neoprene sleeve insulates hand from cold during discharge compatable with threaded co2 cart