Beneficial in promoting co-ordination and blood circulation, great for musicians, guitarists, pianists, drummers etc., and also be rehabilitates sore muscles and joint.
Small, compact and transportable, you can take anywhere. It is easy to start by toggling the ball with your finger.
Cool LED lights inside will light up while spinning, no battery needed, powered by rotating the wrist, All you need do is to increase the speed by making a rotational wrist movement and to keep in sync with the spinning of the ball.