The Shadow Conspiracy Cranium sprocket is one of the coolest sprockets ever released in BMX! Click HERE for available colors/sizes and to order yours now. Features stronger and stiffer 7075 alloy which is super light and extra strong! 1/8″ flat design teeth. 5mm thick 7075-T6 alloy. 15/16″ bore (24mm compatible). Includes 19mm & 22mm adaptors. Weight: 3.6 oz. for 25t.