... the coating, shape, size Surface treatment: Ni, Zn, Epoxy, Gold, Silver, Tin, Ni+Cu+Ni and Cr3+ZnSize available: 0.5 ... Application of NdFeB, AlNiCo & SmCo magnets Speakers, Earphones, Microphones, Loudspeakers, Mobile Phone, Automobile, Motor, Engines, Printer, Toys, instrument and detecter, Sensors ...