With magnet (60cm) *Terahertz purity: 99.999% (Quality inspection data in Japan has been confirmed upon purchase from the manufacturer) *Terahertz waves are electromagnetic waves located between "light" and "radio waves." They gently act on human body molecules and activate cells. Because the frequency of vibration is 1 trillion times per second, it is called terahertz waves (tera means 1 trillion). Terahertz waves penetrate even deeper than far-infrared rays, which are known to have beneficial effects on the body, penetrating about 10 cm from the skin into the body. Therefore, terahertz waves are said to be effective in promoting blood circulation, reducing coldness and stiffness, maintaining health, and preventing aging.