Ring Neodymium Magnet with black epoxy coating Neodymium magnet (NdFeB), commonly known as "rare earth" magnet, is a high-performance permanent magnet made of neodymium, iron and boron alloys. They are real permanent magnets and will not lose their magnetism unless heated to a temperature exceeding the maximum operating temperature rating or their protective coating is damaged. Characteristic: -Energy products may exceed 50mgoe -Low corrosion resistance Applications: -automotive -electronics (sensors, speakers, scanners) -medical (scanners) -magnetic separator