1,STRONG MAGNETIC: The powerful magnet is made of premium neodymium iron boron and stainless steel, which is small and light, and has strong magnetic force. 2,CORROSION RESISTANT: Three layers of nickel, copper and nickel coatings to reduce corrosion and provide a smoothly surface. 3,LONG LIFE SPAN: The use of powerful neodymium magnet will not break in normal use, because the magnet is protected by the inside of the steel cup, which greatly improves the service life of the magnet. 4,WIDE APPLICATION: The magnet is suitable for home, office, classroom, school, science, adult, children's science and interesting decoration. 5,10PCS: There are 10 pieces magnets in the package that suitable for long term use and make replacements. 10 x Countersunk Hole Magnet Item Type: Countersunk Hole MagnetMaterial: Neodymium Iron Boron, Stainless SteelColor: SilverSurface Electroplating: Nickel platingWorking Temperature: 80 ℃Application: Suitable for family, office, classroom, school, science, adult, children's science and interesting decoration. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin