APS HAKKOTSU 12pcs Thunder B Co2 Sound Grenade M18 Smoke White Shell Bottle Package with CoreAPS HAKKOTSU 12pcs Thunder B Co2 Sound Grenade M18 Smoke White Shell Bottle Package with Core Made out of metal and polymer fiber. Comes with 12pcs Sound grenade M18 Smoke White bottle Shells, 1pc safety pin, 1pc main core. Does not come with gun powders. Noise level 105db. Simply replace the Co2 gas cylinder and the outer shell after use then you can fire again. Powered by disposable Co2 gas. Original Packing