... your business 5: Top quality,Top Service Wrist ball for promotion or match or playing on beach Materialplastic/pc with steel axle ... appointed forwarder Usage: mainly for sports like tennis, golf, basket-ball, table tennis, badminton, bowling, rowing, rock-climbing ,basketball, motocross, ... to keep in sync with the spinning of the ball. Roller ball doesn't need batteries, is only slightly bigger than ...