... 80-200'C Custom-made dimension Precise tolerance Neodymium Rare Earth Block Magnets with holes, N35,N38,N40,N42,N45,N48,N50 ... ,N52.. Product specifications:1. Neodymium rare earth block magnets with different grades of: N35,N38,N40,N42,N45 ... appliances,microphone parts,transmission equipments...Features of Neodymium magnet :Neodymium magnets are mainly made from neodymium ,iron, and boron. ...