Ring rare earth magnet high Br, Hcj & (BH)max, various sizes, ... N33EH, salt test: 24 to 72 hours. Ring rare earth magnet We are well equipped to manufacture these materials to ... customers' specifications. Product Description Material Grade of NdFeB magnet: Magnet N-( N30,N33,N35, N38, N40, N42, N45 ... , Copper+Nickel, Epoxy, Gold, Silver, Passivation, and custom coating available upon request.