Specifications: 100% new authentic<br />Material: magnetic material<br />Category: bracelet<br />Health functions: health care， magnetic therapy， weight loss<br />Size: 8mm black stone<br />Precautions:<br />1， with pacemakers or patients who had undergone cardiac surgery can not touch.<br />2， this magnet must not contact the magnetic card (bank cards， meal cards， bus cards， student cards， etc.)， mobile phones， computer electronic tired items.