Wirst sports crazy ball Wrist ball with NEON&counter Increase strength of ... Perfect exercise gadget for sports like golf, tennis, squash, cricket, badminton, baseball, bowling, basket-ball,, motocross, mountain climbing ... rotor has been corrected by computer, so the ball has very excellent stability.2) There is ... rubber on the surface of the ball. That can prevent the ball from sliding down to the ground ...