The Robby's Revs II features a shorter design to provide medium power for light to medium lane oil 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. Made of feather-light duraluminum, the Robby's Revs II is a breakthrough in wrist support, because it conforms to your exact needs.The new standard in lightweight, adjustable power.