This stone has been used as healing stones for thousands of years in Traditional Chinese Medicine. The stone contains more than thirty trace elements and is said to dredge the bodies channels, improve microcirculation, and eliminate excess heat. Gua Sha is performed at a 15-45 degree angle between one of the stones edges and your skin, in one direction, and in even strokes. ALWAYS remember to apply an oil to your skin before beginning your massage. After each use rinse with warm water and gentle soap, followed by placing the stone back into its protective sleeve.