I purchased several terahertz gua sha tools last year, and I'm selling this one because I don't use it often. (Retail price: 7,600 yen (including shipping)) The mushroom shape is designed to fit comfortably around the inner corners of the eyes, the neck to the upper collarbone, and behind the ears, making it easy to massage. Of course, it's also great for the head and feet. ◆ What is Terahertz Stone? It is an artificial mineral that emits a frequency of approximately 1 trillion molecular vibrations per second in the far-infrared region, called terahertz waves. It is said that this vibration acts deep within human cells, correcting the rhythm of distorted cells and returning them to the correct rhythm, as well as improving stiffness and blood flow. ◆ What are the effects? Terahertz stone is said to activate cells, promote blood circulation, and eliminate excess waste products. It is said that when blood circulation improves and unnecessary substances in the body are removed, it can lead to the relief of stiffness, swelling, and coldness. ※If you don't need the outer box in the first image, it will be a simple package, but I will discount it by 500 yen.