I received this as a gift, but I'm selling it because I don't use it. HAHONICO Pro Tourmaline Roller & Gua Sha Stimulates acupressure points, meridians, and lymph nodes to relieve scalp stiffness. Promoting meridian flow can balance the body and is expected to have beauty benefits. The main body uses elastomer resin, so it can be used safely even on sensitive skin. By incorporating tourmaline into the main body, it generates negative ions and is expected to have far-infrared effects.