Featuring a DW Delta ball-bearing hinge on all moving parts, an offset sprocket for increased power and adjustable toe clamp, the DW 5000 AD4 Accelerator Double Bass Drum Pedal's nearly infinite capacity for customization to suit every playing style has made the pedal an industry standard for decades. Quick, powerful, and excellent for heel-up players looking for the most speed and articulation they can get, the AD4 double provides tasteful triplet accents or full-on kick blasts without missing a beat.