... to make it strong.1. General features of the NdFeB magnet:NdFeB Magnet Grades: N33, N35, N38, N40, N42, N48, N50 ... , Zn, Ag, Au and other special platings and coatings Shape: arc, tile, square, cylinder and magnetic ring with various ... the NdFeB magnetGenerators, servo motors, DC motors, computer rigid disc drives Loudspeakers, annunciators, linear actuators, microphone assemblies Magnetic separators, ...