N42 disc permanent ndfeb magnet 1.grade: N35-N52,(M,H,SH,UH ... Max. Operational temperature: Up to 230c) Sintered Neodymium Magnet Outsanding product:1)high performance:N52,N48M,48SH,42UH,38EH ... loss less than 2 mg/cm2 Sintered Neodymium Magnet applications:loudspeakers,motor assemblies,windmill,Home appliance,acousics, ... for your test. N42 disc permanent speaker ndfeb magnet N35-N52,(M,H,SH,UH,EH)