N38 neodymium rare earth ring magnets 

N38 neodymium rare earth ring magnets N38 neodymium rare earth ring magnets more details as below: Material NdfeB Grade N38 Outer Diameter 58mm Inner Diameter 41mm Thickness 5mm Magnetizing Direction Axial Magnetization (Thickness) Plating Coating Nickel Magnet Weight 49.5g                              N38 D58*41*5mm neodymium large ring magnet more detailed photos: