Roar Control features Birzman's patented 'Turn Pierce Function' with a build-in valve that allows for effortless, controlled inflation by turning the cartridge to increase, decrease or stop the flow of CO2.

Turn the cartridge clockwise to puncture and close the valve; counter-clockwise to open the valve and release CO2.

Compatible with both Presta and Schrader valves; 16g threaded cartridges.