... with best quality. Sintered NdFeB Magnet1. Material and Grades:Sintered Neodymium Ferrite BoronN35~N52, N35M~N50M, N30H~N48H, N30SH~N45SH, N28UH ... , rotors, wind turbines, wind generators, magnet hooks, magnet holders, magnet filters, magnet rod, toys and accessories, etc. 5.Certificates: In 2001, ISO9001: 2000 quality system ...