... 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, ... GS, Hcj: 11,000 to 30,000 Oe, BHmax: 35 to 50 MGOe) Maximum working temperature: 80 to 200 ... and etc.If you are interested in this magnet, please contact me at any time.