... certification:SGS,ISO9001 Coating:Nickel magnetization:according to you n speaker magnet mainly comprised of neodymium ,iron and boron,is ... much higher than 1.67 the consisitency of surface magnetic field and magnetic flux can be controlled with +/-1%4 ... ,average low weight loss less than 2 mg/cm2 speaker magnetapplications:loudspeakers,motor assemblies,windmill,Home appliance,acousics,communication ...