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It is applied by centrifugal force and inertia like a gyroscope. There is no battery or electricity inside the device, it is powered by rotating the wrist

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Functions:

• Perfect exercise gadget for sports like golf, tennis, squash, cricket, badminton, baseball, bowling, basket-ball, motocross, mountain climbing.
• Increase strength in fingers, wrists, hands, forearms, biceps, triceps, ligament and shoulders.
• Great benefit for musicians, guitarists, pianists, drummers.
• Rehabilitates sore muscles and joints.

Features:

• Brand new and high quality!
• New designed sports apparatus.
• Exercises arm, wrist and removes fatigue.
• Promotes blood circulation.
• Based on mechanical principle.
• Rotating speed can reach 8000 rev/min.
• Built-in LED flashlight (batteries built-in).
• LED automatically lights up while spinning.
• For people 6 years and older.
• The easy yet effective exercise to improve your forearm, wrist, finger strength.
• Power up your shots, strikes and take your games to next level.
• Prevent injury, sore wrist, and tennis elbow (Lateral Epicondyle ) or even get rid of it.
• Great for fitness, rehabilitation (Therapeutic), or just for fun.
• It's a very nice gift, especially for sports lovers and musicians.

Specification:

• Material: Zinc alloy rotor + PC plastic shell
• Colors: Green
• Product dimensions (Dia. x H): 7.5 x 6.5cm
• Gross weight: 290g

Package Includes:

1 x Gyroscope power ball 1 x Starting rope 1 x Hand strap 1 x Manual