Delivering the ultimate in Speed, Rebound, and Accuracy, the Pearl Demon XR (for X-treme Response) Bass Drum Pedal is a true Triple-Threat in bass drum pedal performance. The result of a two-year research and development project with drummer George Kollias, its streamlined machine shop design and fluid direct-drive action delivers a faster, smoother stroke. Its enhanced rebound action comes from the exclusive interchangeable high-tension spring, which makes repeated strokes effortless in the most extreme musical situations. Primed for the high-tempo technicality, the Pearl Demon XR is perfect for any drumming style where precision and endurance are key. Drive Direct Drive Footboard Longboard Machined Aluminum Bearings Ninja Bearing Spring Extreme High-tension Spring (Normal Spring Included) Beater X-treme Impact Beater (B350xr) Tension Adjustment Click-lock Beater Angle Uni-lock Beater Angle Case Included Hoop Clamp Pivoting Hoop Clamp Hoop Clamp Tension Bolt Wing-bolt (Key-bolt Included)