N42 disc permanent ndfeb magnet 1.grade: N35-N52,(M,H,SH,UH,EH) 2.ceritfication:ISO9001:2008 / SGS 3.good ... ,38EH,33AH2)high working temperature:the AH series with 40 k Oe super-high coervice force can replace SmCo magnets successfully ... test. N42 disc permanent speaker ndfeb magnet N35-N52,(M,H,SH,UH,EH)