Pacific’s 400 Series bass drum pedals offer great performance at an affordable price-point. They include a choice of single or double models with the security and stability of steel pedal plates and the tonal flexibility of two-way beater balls. The 400 Series pedals feature an economical chain and cam drive, built-in spurs, spring tension, and a three-position stroke adjustment. Chain &; Cam Drive Aluminum Hinge Steel Pedal Plate Side Adjusting Hoop Clamp Spring Tension Adjustment