Maruyama-style Coil Black Eye, Pack of 2 Expected effects include "pressure effect," "improved circulation," and "relief of stiffness" through the power of the coil and far-infrared rays. It works on the body's bioelectric current, allowing you to perform at your best. For more details, please visit the manufacturer's website. https://blackeye.jp/ They worked so well, I ended up buying too many. Brand new, unused. Reusable and economical. General medical device notification number: 23B2x00010000001