DW reengineered the pedal that established its reputation for innovation and quality. Because innovation is part of DW's DNA they thought it was time for some major improvements. Most notably, the toe clamp. The 5000 needed more gripping strength, providing a stronger connection between the drummer and kick drum. So, they developed the Tri-Pivot Toe Clamp. Three independent 360 degree, rotating rubber pads firmly pinch almost any diameter and thickness bass drum counter hoop from the top and the bottom, with zero slippage. Add to that a new textured rubber grip pad on the base plate - there’s never been a better system for attaching a pedal to a bass drum. Last, but certainly not least they added a Dual Bearing Spring Rocker, making the 5000 quicker and more responsive.The 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.Features:DW’s patented Delta Ball-Bearing Hinge is a state-of-the-art lightweightaluminum design that incorporates ball bearings at both sides.The AD4 and TD4 pedals feature a Dual-Bearing Spring Rocker deliveringultimate smoothness.The NewTri-Pivot Toe Clamp ensures the pedal and drum stay connected nomatter what hoop size or angle. Convenient Clip with Drum Key also included.The Single Post Casting design on DW’s double pedals provides ease ofmovement between the pedal and hi-hat, also allowing the pedals to be playedsimultaneously.DW’s unique Universal Assembly (with memory lock) is made in the DWfactory.The New Non-Skid Rubber Grip will keep your pedal planted wile beingeasily adjustable. DW DWCP5002AD4 5000 Series (AD4) Kick Pedal, Double, w/ Bag.