This CO2 Injector is incredibly easy to use, Its gets a big thumbs up from all the weight weenies and is incredibly compact. The patented push button makes it super easy to control the airflow. The pump is 100% CNC machined aluminium, the specially designed angled head fits both Schrader and Presta valves. It is compatible with 16 g gas CO2 cartridges. Comes supplied with 2x cartridges.