Ships from HongKong.Reaction ball throwing there will be no directional bounce on the ground, is essential supplies velocity response exercise. Athletes need to exercise better sensitivity, using similar tennis as the size of six corners, the bounce of the ball on the ground is very difficult to judge its second third point, so players like in the ground very unexpected ball on the spot, produced excellent responsiveness to help. Coordination reaction speed of training auxiliary tool. Exercise enhanced grip, finger strength, suitable for hand rehabilitation care. Can increase the hand flexibility and muscle, improve hand slow. Contribute to the coordinated development of the hand eye and quick reaction force. Suitable for any need to react quickly to the movement.