We are a professional manufacture of the wrist ball, our products are very popular with the best quality and competitive price. We have exported this item for a long time with a very big quantity. We have CE certificate of this article. Now we also develop the ball with light but no battery. There is self-contained mechanism dynamicaly balanced gyro in the ball. The ball can increase your wrist strength while having fun. The speed will reach 10,000 R. P. M. It is suitable for adult and teenager. If you are interested in this article, our factory is your best choice!