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☞[Mechanical power, no power supply]: The rotation of the wrist interacts with the rotation inside the center of the sphere, and the centrifugal force

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☞[Pure mechanical design]: The rhythm and speed of the core rotation can be adjusted arbitrarily through human control. The faster the speed, the

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Resbo Auto-Start Gyro Ball, Solid Color Hand Strengthener Wrist Exerciser Wrist Trainer Ball with LED Light (Blue) - Yahoo Shopping

Wrist Trainer Ball - Self-Starting Gyroscope Powerball

☞[Pure mechanical design]: The rhythm and speed of the core rotation can be adjusted arbitrarily through human control. The faster the speed, the

Wrist Strengthening Device, Self-Starting Gyro Ball, with LED Lights, Metal Silent Centrifugal Fitness Power Device (Color : Blue)

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Resbo Auto-Start Gyro Ball, Solid Color Hand Strengthener Wrist Exerciser Wrist Trainer Ball with LED Light (Blue) - Yahoo Shopping

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