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NdFeB magnet is made from Neodymium, Iron, Boron and some other transitive metallic elements to make it strong.1. General features of theNdFeB magnet:NdFeB Magnet Grades: N33, N35, N38, N40, N42, N48, N50, N52 (M, H, SH, EH, UH)Coating: Ni, Ni-Cu-Ni, Zn, Ag, Au and other special platings and coatingsShape: arc, tile, square, cylinder and magnetic ring with various sizesHigh magnetic performance (Br: 11,000 to 14,500 GS, Hcj: 11,000 to 30,000 Oe, BHmax: 35 to 50 MGOe)Maximum working temperature: 80 to 200 centigradesSuper strong magnetic force and high intrinsic coercive force and also with precise tolerance2. Applications of the NdFeB magnetGenerators, servo motors, DC motors, computer rigid disc drivesLoudspeakers, annunciators, linear actuators, microphone assembliesMagnetic separators, automaticmahjong machinesToys and other industries and etc.If you are interested in our half ring magnet, please contact me at any time.