A CO2 dispenser with a control knob for easy, controlled inflation. CNC machined aluminum dispenser with brass internals. CNC control knob twists for easy and controlled inflation. Twin Slip Chuck head presses on to Presta and Schrader valves. Neoprene sleeve insulates hand from cold during discharge. Compatible with threaded CO2 cartridges, comes with one 16g or 25g cartridge.