| 摘要 |
A rotating play device capable of training wrist coordination has a main body of a semi-spherical cage frame braided by the bar skeleton with several ring rails of different breadths formed respectively along the looping ring portions on the spherical surface, crossed and connected on the top surface of the cage frame by several radial and longitudinal rails. A holding cover is mounted on the top surface of the cage frame for the user to hold by finger holes formed in the holding cover. When in use, a ball is placed in the cage frame, and the user holds and rotates the main body of the device by controlling the strength of the wrist and the arm to make the ball roll inside the main body via centrifugal.
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