【Material】: Uses Japanese terahertz ore "99% purity." Tested by a public institution. 【Size】: Wing-shaped (approx. 70-50-6.6mm) 【How to Use】: For daily beauty and health, massage the areas of concern with the gua sha. Using oil or cream will allow for smoother use. ※Precautions for use: Do not press hard and avoid excessive pressure. 【Accessories】: Comes with a drawstring bag.