Product Description The KR Strikeforce Pro Rev 2 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 to choose from.. Please note that the Pro Rev 2 is identical to the Robby’s Rev II, it has been rebranded to the KR Strikeforce brand for the 2021 fall bowling season.