DW has reengineered the 5000 series pedal with a new, better gripping Tri-Pivot Toe Clamp. DW also added a Dual Bearing Spring Rocker, making the 5000 quicker and more responsive. These pedals feature aluminum hex shafts, pedal plates and linkages, 101 two-way beater, and built in spurs. The DW Accelerator (AD4) drive system offers an eccentric motion that creates an indirect relationship between the sprocket and the footboard, increasing the velocity of the pedal by shortening the length of the stroke. It is recommended for situations that require increased speed and sensitivity. Includes a Nylon Carry Case.