| 摘要 |
A hand held device for exercise and amusement has a clear plastic circular tube with a central handle. One or more balls are inserted into the circular tube. One holds the central handle and causes the ball(s) to move around the tube. Balls of different weight can be inserted in the tube. The device can be illuminated. The illumination may take the form of lights which are turned ON or OFF by the motion of the ball(s).
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