This is a blue ARTS product balance band, size M (17.5cm). It uses tourmaline and original minerals to adjust your center of gravity and guide you towards your natural athletic function. Wearing it on your arm can correct your upper body posture, and wearing it on your leg can alleviate fatigue from the lower body, supporting your health. Your center of gravity is adjusted depending on whether you wear it on your leg or arm. Retail price: ¥4950