... ,horn speaker 3) ODM/OEM Service Detailed Parameter of GM-37:1) China Direct Manufacturer2) RoHS3) Material:Neodymium ,N35H / ... N38H / N42H 4) Item Dimensions: 37*26.7*10.5mm5) Temperature Resistance:>=100 Degree CelsiusProduct Characteristics ... to guarantee customers' benefitsDistinct Picture of MG-37: MG-37 speaker neodymium magnet, driver unit neodymiun magnet,china