ZOUKFOX Update Auto Start Power Wrist Gyroscopic Ball,Wrist Strengthener and Forearm Exerciser Device for Arm Fingers Wrist Bones and Muscle (grey1)
- It is great gyroscopic ball for your arm,fingers,wrist and muscle.It is new design,easy to use..
- It is small you can easy to anywhere.Also good as warm-up sport before you do climbing,golf,basketball guitars etc ..
- Auto start with internal pre-tensioner, incredible high speed up to 20,000 rotational speed per minute pass through testing.
- Pure mechanical wrist ball, no batteries need.you just need to make your wrist get sport.The faster you spin the harder your muscles work.