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. This is the 5002AD4H model, which is heelless. This rock solid, fast, quiet pedal is total quality. Hit up the Drum Center of Portsmouth for all your DW hardware needs!