... . Principal applications are DC motors, loudspeakers, reed switch operation, magnetic separator assemblies and general holding devices such as pot magnets ... made from the stainless steel, tungsten, Iron-base alloy, tool steel, hard metal alloy. 2,Rare earth magnet, including sintered Neodymium-Iron ... requirements4.Quantity5.Dimension and tolerance(drawing will be preferable) ferrite soft magnetic core