Terahertz Gua Sha S-shaped Knife for Full Body Approximately 131.6mm x 38mm Approximately 60g 【Terahertz】 Terahertz ore is a mineral artificially created by melting quartz at high temperatures and collecting silicon. The one trillion vibrations per second (terahertz waves) emitted by terahertz ore penetrate various substances such as wood and plastic. Also, because of its high thermal conductivity, when applied to ice, the vibrations plus heat conduction from the hand quickly melt the ice. It is said to have effects such as promoting blood flow and enhancing natural healing ability, and is widely used in medical and industrial fields. It is attracting attention for its positive effects on beauty and health, such as cell activation, improved blood flow, and skin firmness.