…Or Chinese balls!
I have been playing with these balls a long time.
Used mainly on my hands, to improve arthritis.
Before checking wikepidia, I thought there are many ways to play with them.
Chinese use Woden balls, 'cause the chime sound can disrupt meditation.
I applied them on my arms and legs when having inflammation spasms and felt better.
I believe that can be used as a good massage tool.
Right pressure on ligaments can improve blood flow and activate nerves.
It’s been said that brain improves greatly after using them regularly.
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I love mine 
my boyfriend got me a pair several years ago that came in this pretty plain wooden box. They sit on my desk and I use them periodically 
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