Portable Terahertz Scraping Board Skin Tightening Muscle Pain Relief Gua Sha Scraping Tool Item Type: Terahertz Scraping Board Material: Terahertz Size: Approx. 70 x 50 x 6.6mm / 2.76 x 1.97 x 0.26in  The function of energy stone is through self purification, self repair, self release, self regulation, self adaptive high tech materials, to achieve the purpose of odor absorption, temperature regulation, humidity regulation, electromagnetic shielding, energy saving and health benefits. Energy stones contain more than 30 trace elements such as selenium, zinc and calcium, which are beneficial to human body. The initial wave released by these elements is in the same wave state as the initial waveof human cells, which can produce resonance to make human cells and tissues more active, promote blood circulation, promote metabolism and eliminate waste in the body. Function: 1. Reduce facial tension 2. Enhance skin elasticity, firm and tighten skin 3. Reduce the appearance of fine lines and wrinkles 4. Reduce puffiness, puffy eyes and dark circles 5. Promote beauty products absorption, such as creams and serums, deeper into the skin 6. Promotes blood circulation to the face for a natural healthy