... 3) fast and safe delivery & excellent service N42 8*8mm permanent super strong neodymium magnet These magnets will have ... plated with 3 layers of protective coatings - Nickel + Copper + Nickel (Ni-Cu-Ni). Shape:DiscDiameter8mmThickness:5mmGrade:N42Plating ... Round, Disc, etc.MaterialsSintered Neodymium-Iron-BoronCoatingNickel,Zinc, Nickel+Copper+Nickel, Epoxy, Gold, Silver, Cr3+Zn, any coating ...