Ring Neodymium Magnets

Neodymium ring magnets are powerful, permanent rare-earth magnets characterized by their circular "donut" shape with a hollow, concentric center hole. Composed of a neodymium, iron, and boron (NdFeB) alloy, these magnets are celebrated for having the highest magnetic strength-to-size ratio commercially available. They are typically manufactured with axial magnetization—where one flat face acts as the North pole and the opposite face as the South—but they can also be radially or diametrically magnetized for specific applications. Because NdFeB is prone to corrosion, these magnets are almost always finished with a protective coating, most commonly nickel-copper-nickel (Ni-Cu-Ni), giving them a shiny, silvery finish.