●This arm produces a performance of your Powerball up to 300% higher. ●Suitable for use with most Powerball Gyro models (* Except the metal range). Note: The arm does not understand the Powerball. ●More than 20 new movements. ●Simulates with precision the grip zone and effort required to practice most sports. ●Easy to use - just adhesive strips drive for your powerpall and kept for space.