This is a terahertz bracelet. Terahertz ore is known as a "healing stone" and is said to be good to wear: - When you want to refresh your mood - When you want to improve concentration - When you want to balance your mind and body It is said to emit a frequency called terahertz waves, which are said to vibrate molecules about 1 trillion times per second. Please try putting ice on it. Although it is new, there may be fine scratches. Please purchase only if you understand.