This stone was custom made by a Dr. of acupuncture in order to bring the most personalized approach to your gua sha routine. Each portion of the stone is designed to hug your skin to enhance the sculpting feature. Our custom gua sha tool is made with a curved tooth edge to help release muscle tension in both the body & face. The stone is made of pure Bian which is known for it's antiaging & antioxidant effects. Bian is considered "stone medicine" & has been used in Traditional Chinese Medicine (TCM) for thousands of years. Each stone removes 50 plastic bottles out of the ocean through a partnership we have with Plastic Bank. Your purchase is good for you & the planet! * We offer gua sha training in order to help enhance sales & provide your customers with valuable education.