... price 3.Short lead time and all-round disc speaker magnet Magnet(NdFeB magnet) is made from Neodymium,Iron ... the Neodymium magnets(Ndfeb Magnet)1.) Electro-Acoustic Field: Receiver, Speaker, Microphone, Audio alarm stage, Loudspeaker2.) Motor Field: Voice ... has passed SGS approve,ISO9001:2000 Quality System Certificate, and ISO14000 Environment System Authentication, if need, we could provide ...