Grade Work temp. N35-N52 =80 ? N35M-N50M =100 ? N33H-N48H =120 ? N33SH-N45SH=150 ? N28UH-N38UH=180 ? N28EH-N35EH=200 ? Size:Customized according to your requirement. Material:NdFeB magnet Shapes:Disc, Round, Cylinder, Block, Square, Ring, Arc, Triangle, Trapezoidal, etc. Tolerances:Standard tolerances, usually +/-0.1mm. Coating:Zinc, Nickel, Gold, Silver, Epoxy, Parylene etc.