The lezyne control drive is a co2 inflator with regulation twist control this gives you full control of how much pressure you put in your tires the head has the ability to inflate tubes with either presta or schrader valves simply twist on and off a neoprene sleeve is supplied with the inflator which insulates your hand from the cartridge when the pressured co2 is released the controld drive is supplied with a 16 gram threaded co2 cartridge so that you can jump straight on your bike and go