... Sizes, Coatings and Shapes. Warmly welcome your inquiries!NdFeB magnet is made from Neodymium, Iron, Boron and some other ... to make it strong.1. General features of the NdFeB magnet:NdFeB Magnet Grades: N33, N35, N38, N40, N42, N48, N50 ... precise tolerance2. Applications of the NdFeB magnetGenerators, servo motors, DC motors, computer rigid disc drives Loudspeakers, annunciators, linear actuators, ...