This is a piece of gold-plated rectangular neodymium magnet, the surface of the use of radium carving to mark the N, S pole, convenient for you to distinguish, but radium carving process is more expensive, generally less customers use, we often recommend customers to use the line to mark in order to save costs, if you really need radium carving we can also according to your size for quotation.
Radium engraving effect on the surface of nickel-plated rectangular neodymium magnets