Magdev sintered neodymium iron boron n35h permanent disc magnets magdev dcni03221n a 6 x 6mm permanent disc magnet made from n35h grade sintered neodymium iron boron ndfeb this type of magnet material gives the highest energy per unit volume of any permanent magnet material being capable of lifting up to 1000 times its own weight suitable applications for this disc magnet include audio aerospace automotive medical and renewable energy magdev dcni03221n neodymium iron boron 6x6mm n3