The DW Delta 3 Accelerator Double Bass Drum Pedal's drive system creates an indirect relationship between the sprocket and footboard for maximum velocity and excellent sensitivity. You'll love the improvements DW designed into the 5002AD4, such as the innovative rubberized Tri-pivot Toe Clamp, a textured rubber grip pad on the base plate, and the Dual-Bearing Spring Rocker that serves up silky smoothness. DW 5000 series hardware has remained the standard of the industry for over a quarter of a Century, and is the choice of drummers everywhere.