DW Drum Workshop 9000 Series Double Bass Drum Pedal with Case Delta ball-bearings at the rocker, hex shaft, and hinge. Employs friction-reducing ball-bearings in the rotor and spring connector. Stackable heel plate, dual/side adjusting hoop clamp, 101 2-way beater, built-in spurs, and lightweight aluminum pedal plates and linkages. Includes a custom-designed, injection-molded case with special compartments for pedals, beaters, and accessories.'