The Robby's Revs is new standard in lightweight, adjustable power. Made of feather-light duraluminum, the Robby's Revs is a breakthrough in wrist support, because it conforms to your exact needs. The extended finger support provides maximum power for oilier lane conditions. Lateral adjustments allow your hand to be in position to alter the amount of forward roll and spin on the ball. Four forward wrist-cup positions allow for rev control.