YM0870X Material: Sintered neodymium iron boron Process: Three-layer copper and nickel plating Diameter: 20.0 mm Thickness: 5.0 mm Hole Diameter: 5.0 mm Magnetizing Direction: Thickness magnetizing Magnetic force: 2800Gs Working Temperature: Up to 80 degrees Celsius 10 pieces per set Corrosion resistant and rustproof Lightweight， miniature size and high magnetic force Perfect magnetic toy Package Details Weight: 203.30 g Size: 6*2*2 cm