Features:
- Suitable for those who need wrist training， such as sportsman， computer typist and pianist
- Lightweight and portable， you can exercise whenever and wherever possible
- Durable material， environmental， tough and harmless
- Steel axis， not easy to deform and break

Note:
- Be sure that do not touch the ball body when it is at high-speed revolving
- Keep clean inside of ball and avoid any minor articles
- Keep away from moist and watered places
- As it is precisely produced， never fall on hard surface 0.285 Package weight: 0.33 kg
Package Size(L x W x H): 11.00 x 9.30 x 6.50 cm / 4.33 x 3.66 x 2.56 inches Package Contents: 1 x Wrist Ball， 1 x Strap， 1 x Multilingual Manual in English / German / French