Neodymium Iron Boron magnet is a member of the Rare Earth magnet family and is the most powerful permanent magnets in the world. They are composed mainly of Neodymium (Nd), Iron (Fe) and Boron (B). So, they are often referred to as NdFeB magnets. We can supply various shapes of NdFeB magnets including ring magnets, disc magnets, rod magnets, block magnets, sphere magnets, arc magnets and etc.