1. The NdFeB magnet is sold by size, the unit of measurement is millimetre, please pay attention to the size. 2. Related electronic products, such as Mechanical watchs ,bank cards, mobile phones, computers, televisions, pacemakers, etc., they are easily affected by neodymium magnets, please keep a certain distance to avoid unnecessary losses. 3. When connecting two magnets, draw them close to each other slowly and gently. Hard crushing would cause damage and cracks in the magnetic material ,The NdFeB magnet have unbelievable magnetic performances , Don't hurt your hands when in use 4. The neodymium magnets are fragile, especially for the large-sized strips and sheets,Please put them lightly ,and be careful to stagger the magnets when separating. 5.Please keep away the magnet from high temperature and corrosive environment，although there is a coating on the surface of the magnet.