The Avenger II bass drum pedals deliver fast, solid, double-cam action with simple execution. These double pedals have a four-bearings-per-drive system. Easy key access adjustable hoop clamp, adjustable spring tension and ROCK stabilizer plates with Velcro base give a solid, balanced feel.Double-chain cam drive system with four bearings per drive Dual-surface/self-aligning beater with hardened steel beater shaft ROCK stabilizer plate with Velcro on base Easy key access hoop clamp Adjustable spring tension