We strongly advise you to use a stone-made tool. Unfortunately, the quality of many of the Gua Sha tools available on the internet leaves much to be desired. The nephrite stone and quartz are favourites. If you're not sure which stone and shape are best for you, start with a basic tool in a classic shape to master the fundamentals. A quartz Gua Sha body massage tool, for example, could be a good place to start.
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