Description:A ball that emits a high-pitched squeal is hooked to the end of a cord and whirled about the instructor's head or thrown from person to person. The Doppler effect can easily be heard throughout even a large room.
An X or patch on the fabric of the ball marks the location of the concealed switch.
Availability:Temporarily Unavailable - Being Repaired
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Last modified on Wednesday, 13 March 2019 08:20