... ,Metal injection molding, made from the stainless steel, tungsten, Iron-base alloy, tool steel, hard metal alloy. 2,Rare earth magnet, including ... rectangular blocks, discs, rings and segments. 3,Ferrite magnet: Hard ferrite magnet and soft ferrite magnet including the MnZn and NiZn. 4,Die-cast ... ).2.Purchasing quantity .3.Materials and other requirements. injection molded ferrite magnet ring