Complete grenade kit Reusable CO2 gas cylinder & outer shell Creates noise level over 130db Can be attached to tactical vests or jackets Incl. 1 main core body, 12 cylinder shells & 2 safety pins Attach this Hakkotsu Thunder B grenade to your tactical vest or jacket for intense airsoft skirmishes. The Thunder B detonates similar to a real grenade but does not contain any gun powders, assuring the safety of competitors on the battlefield. The grenade is powered by disposable CO2 gas and creates an explosion of 130db when detonated. Each Thunder B grenade is reusable. Simply replace the CO2 gas cylinder and the outer shell after each use.