wrist ball

Dynamic: Non-battery. Non-electricity.
It is powered by rotating the wrist. The faster we rotate the ball, the stronger the dynamic and torsion is

Increase your wrist strength while having fun. Wrist and finger grasp strength. Forearms muscles strong.

It's with red/blue light. It has a generator inside, no batteries and no
chemical matters. The ball glitters by the dynamism the user's hand makes.

Transportation:by sea; by air;

Increase your wrist strength while having fun. Wrist and finger grasp strength. Forearms muscles strong.

Transportation:by sea; by air;