... certification:SGS,ISO9001 Coating:Nickel magnetization:according to you n speaker magnet mainly comprised of neodymium ,iron and boron,is ... N48M,48SH,42UH,38EH,33AH2)high working temperature:the AH series with 40 k Oe super-high coervice force can ... days,average low weight loss less than 2 mg/cm2 speaker magnetapplications:loudspeakers,motor assemblies,windmill,Home appliance,acousics,communication ...