Strong Ring Neodymium/NdFeB Magnet 1.Dimensions: Customized / Produce according to your needs 2.Materials: NdFeB,Grade N35 to N52 (M,H,SH,UH,EH AH) 3.Plating/Coating: Nickel,Zinc,Epoxy and etc. 4.Magnetization direction: Axial,diametrical. 5.Max operating temp.: 80 to 220 degrees celsius Neodymium magnet ring used for high quality loudspeakers and other industrial application. Diametrically magnetized ring magnet used for small motors. Epoxy coated ring neodymium magnet some time be installed in the faucet to act as a filter.