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Give your forearms and biceps an almighty workout!
"Ball within a ball" system creates an immense gyroscopic force.
No batteries required and no chemicals utilised inside
The faster it spins the brighter it lights up.
Just wind up the thread and pull briskly for fun, relaxation and exercise to your hands, wrist and arm.
This is the perfect tool to have not only fun with, but to exercise your hands, wrists and complete arm too. It is very easy to use, you simply wind up the thread and pull out briskly. The dynamic dynamo inside powers the LED lights, the faster you spin it, the brighter it lights up. Can also be used to relax as you spin it slowly.