... :SGS,ISO9001 Coating:Nickel magnetization:according to you n speaker magnet mainly comprised of neodymium ,iron and boron,is ... ,N33AH,N35AH(Max.operational temperature:up to 230c) speaker magnet Outsanding product:1)high performance:N52,N48M,48SH ... weight loss less than 2 mg/cm2 speaker magnetapplications:loudspeakers,motor assemblies,windmill,Home appliance,acousics,communication equipment,toy,car, ...