Tama HP900RSN, Rolling Glide System, Single Bass Drum Pedal, the Rolling Glide features a true round-shaped sprocket with a double chain for more durability, while still providing the smooth, uniform response of the traditional round cam, new bearing Housing, Cobra Coil, Speedo-Ring, Oiles® bearing Hinge, Vari-Pitch Beater Holder, Felt Iron Cobra Beater, included Carrying Cases