The lezyne twin speed drive pump cnc machined aluminum dispenser with brass internals slip on valve operation allows for quick inflation twin slip fit head presses onto presta and schrader valves two piece head allows for easy o ring replacement neoprene sleeve insulates hand from cold during discharge compatible with threaded co2 cartridges comes with one 16g or 25g cartridge lezyne twin speed drive pump features weight 16g neoprene sleeve insulates hand from cld during