Where can I find out how to use these balls correctly.  I was given a pair
by a Chinese Physician who is now in another country.   I wonder if I am
using them correctly.

When rotating them, should you try to do it carefully to avoid the ringing
of the bell inside?
Should you go quickly or slowly?
How long and often is usage recommended?

Is there a web resource I could read about them?

Chegu Tom

Tom Ross
esl@tomrossonline.com
USA