Gyroscope Power Wrist Ball. The faster the rotational kinetic energy is stronger, the greater the power, the equivalent of 50 different weight dumbbells, 8000 rpm is about 14 kg of power, the world record is more than 15000 rpm.
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♥ Exercise your wrists and hands. The hand enhancement ball is the centrifugal force generated by the interaction between the rotation of the wrist
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Gyroscope Power Wrist Ball. The faster the rotational kinetic energy is stronger, the greater the power, the equivalent of 50 different weight
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