Gyro Ball.

Strengthen your wrists and hands.
The Gyro Ball engages your muscles and promotes blood circulation, increase the health of your hands, wrists and forearms.

A useful training tool.
For athletes, musicians, and anyone who wants to improve their grip strength and wrist/forearm mobility. Also doubles are a rehabilitation aid for those with wrist injuries. 

Quick start design.
Just push the core in the direction of the arrow. Which is activated by an internal spring.

Rugged and durable.
The ball core is made of zinc alloy and rolls smoothly.

No power supply required.
The compact design can be taken anywhere, whether in the office, gym or at home, it can be used as a toy to decompress at any time, and it can also exercise arm muscles.

Size: 5.5cm x 7cm

How to use:
Use your fingers to wind it up by pushing the interior ball in the direction of the arrows. Once you have it fully wound up you simply release the interior ball and it will begin spinning. Then you grip the overall device in your palm and move your hand around until you find the sweet spot where you can hear the interior ball spinning faster and faster. Once you find this motion you’ll also feel the resistance in your wrist and forearm. You then simply keep up this motion to keep the interior ball spinning. You can experiment with different ways to hold the ball and can also let it slow down and then attempt to speed it back up with your hand motions.