Product Description The KR Strikeforce Pro Rev 1 features extended finger support that 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 to choose from. Please note that the Pro Rev 1 is identical to the Robby’s Rev I, it has been rebranded to the KR Strikeforce brand for the 2021 fall bowling season.