N52 3000 Gauss Ring Magnet
Strong Neodymium Magnets - these permanent rare earth magnets
Coating : Ni-Cu-Ni, Zn,Black Epoxy ,gold ....
Rare earth magnets are the strongest type of permanent magnet currently made.
They are magnetized through the thickness.
They are composed of neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish.