... disc permanent ndfeb magnet 1.grade: N35-N52,(M,H,SH,UH,EH) 2.ceritfication:ISO9001:2008 / SGS 3.good service ... ,N48M,48SH,42UH,38EH,33AH2)high working temperature:the AH series with 40 k Oe super-high coervice force can replace ... . N42 disc permanent speaker ndfeb magnet N35-N52,(M,H,SH,UH,EH)