Pearl P-2002BL PowerShifter Eliminator Double Pedal, Left-Footed 3-position movable footboards change the feel of the pedals from heavy, regular, and light Quad beater has 2 plastic and 2 felt faces, and point or line contact with the head, to provide 4 distinctly different sounds Roller cam hoop clamp is side mounted for easy attachment and removal of the pedals Uni-pressure spring clamp allows infinite beater angles Floating spring pendulum attaches to the rocker cam inline to significantly improve waggle