Black silica and special ion stone bracelet for hands and feet, size M, navy (17cm-22cm). This bracelet uses black silica, a very valuable mineral mined in Kamino-cho, Hokkaido. Please use it for sports and comfortable daily life. It strongly emits far-infrared rays at room temperature, which enhances the body's immune function. The product condition is new and unused, but individual perceptions may vary, so please check and judge based on the images. I do not smoke. I do not have any pets. I will ship via Yu-Yu Mercari service with tracking. Finally, please be sure to read my profile. - Brand: PREUSSEN - Material: Black silica - Size: M (17cm-22cm) - Features: Contains special grade ions - Application: For hands and feet Thank you for viewing.