1. Rolling and sliding spring doublechain accelerator sprocket, seesaw cam rotation spring tension and tight rod power striking, hinged protective block super stabilizer design including hard shell suitcase. 2. The solid foundation of the pedal can be attributed to its super stabilizer design, which combines a wider bottom plate and frame for absolute stability. 3. At each heel, a specially designed 3piece hinge guard provides a more durable hinge point and extends the pedal to increase leverage. 4. Adjustable beater angle and adjustable beater height, High quality felt, heavy duty constructions, A great choice for replacement on old kits or for expanding kits. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin