... :SGS,ISO9001 Coating:Nickel magnetization:according to you n speaker magnet mainly comprised of neodymium ,iron and boron,is ... has excellent properties of high remanence,coercivity,and Max.energy product. speaker magnet grade:N35,N38,N40,N42,N45,N48, ... ,average low weight loss less than 2 mg/cm2 speaker magnetapplications:loudspeakers,motor assemblies,windmill,Home appliance,acousics,communication ...