... ,N33AH,N35AH(Max.operational temperature:up to 230c) neodymium ring magnetic Outsanding product:1)high performance:N52,N48M,48SH,42UH ... than 1000 hours5) low weight lossPCT:130c ,humidity 100%,vapor pressure 2.7 bar.20 days,average low weight loss less ... than 2 mg/cm2 neodymium ring magnetic applications:loudspeakers,motor assemblies,windmill,Home appliance,acousics, ...