The Tunturi magic ball wrist trainer is a compact and handy training device that you can take anywhere. Whether in the office, at home or on the go - with this practical wrist trainer you can effectively strengthen your muscles in your arm, wrist, forearm and fingers. Versatile application options The wrist trainer (14TUSFU149) not only promotes muscle strength, but also circulation. It is ideal for sports such as golf, tennis, hockey, bowling, table tennis, squash, badminton and many others. Regular training improves your performance and prevents injuries. Battery-free and environmentally friendly A particular highlight of the Tunturi wrist trainer is its battery-free operation. It is powered by the movement of the wrist. As soon as the wheel inside the ball is set in motion, you use your wrist as an axis and turn the ball clockwise or anti-clockwise. The faster you move the ball, the stronger the rotation and momentum generated. This allows you to generate a gyroscopic force of several kilograms. Stylish design and variable colours The Tunturi magic ball wrist trainer not only impresses with its functionality, but also with its stylish design. Please note that the colours of the item may differ from the model shown.