... for sports NEW Fitness LED Wrist Strengthener workout Ball,Power Grip Ball,Power Ball,POWERBALL It is a application by centrifugal force ... steel axle Function:1.Perfect exercise gadget for sports like golf, tennis, squash, cricket, badminton, baseball, bowling,basketball, motocross, mountain ... of silicone rubber on the surface of the ball. That can prevent the ball from sliding down to the ground, and ...