Gyro Ball

Develop & exercise your hand, wrist, arms and shoulder and make them stronger. A perfect training and warm up product for sports, games, playing piano, computer or any other sports:Improve your grip and exercise while having fun.*no battery required*self contained mechanism dynamically balance*increase your wrist strength while having fun*the speed will reach 10,000 R. P. M if you are skillful.Try it!! You will love it.Its good and effective for people of all ages.**logos & trademarks are only for references**
Gyro Ball