Patented features like the free-floating rotor-drive system, rotating swivel spring, and infinitely adjustable cam are aligned to create a more direct transfer of energy that optimizes the stroke for more power and precision. New features have been added to the 9000, including DW's Tri-Pivot Toe Clamp System and Non-Slip Rubber Grip Base Plate. This upgrade results in increased stability and a stronger connection between the drummer and kick drum. In addition, the EZ Adjust Cam allows you to switch from Accelerator® to Turbo®-style sprockets, or anywhere in between, in no time!