When I traveled to China, I always met with my Chinese jade doctor who worked with my jade carver to make jade gua sha tools, jade rollers, other jade health tools to Chinese medicine standards for Ying Yu Jade. He took me to a Chinese hospital and showed me patients being treated for nerve damage, muscle damage and more with these jade rollers and gua sha.
Recently a friend who is recovering from a stroke and goes to physical therapy was frustrated because she is doing everything to get stronger, but cannot get nerves in lower leg and foot to get the feeling again. She is not a "jade lover" but agreed to try using the jade acu-roller, shown in the photo and a jade gua sha scraper. Chinese jade has been used for centuries in China for healing because the jade has good "qi energy". She uses the gua sha to "scrape" the entire leg where the nerves are damaged until she "feels" activity there. Then she rollers the large roller with small "needles" over the same area until she "feels" more. She does this several times daily, and is finally getting "feeling" back because muscle is improving and nerves are healing. Now she can do more physical therapy to improve the muscle strength.
Ying Yu Jade introduced jade rollers and gua sha tools to USA 23 years ago. Of course, now there is a lot of "jade" gua sha and rollers made with "fake jade". But if you want genuine and natural Chinese jade, you are guaranteed to get this on Ying Yu Jade.
Ying Yu Jade has a variety of jade rollers, large medium and small, as well as the large heavier "acu roller" that has the "needles" like used for acupuncture.
And there is a selection of jade gua sha tools to choose from. They all work well, and you choose the tool that appeals to you, because your qi is attracted to it.