Wirst sports crazy ball Wrist ball with NEON&counter Increase strength of fingers,wrists,hands,forearms, biceps, ... squash, cricket, badminton, baseball, bowling, basket-ball,, motocross, mountain climbing.2. Increases strength in fingers, wrists, hands, forearms, biceps, triceps, ligament ... corrected by computer, so the ball has very excellent stability.2) There is a circle of silicone rubber on the ...