All magnets are not created equal. Neodymium magnets are a permanent type of Rare Earth Magnet made from neodymium iron boron and other transition elements. These are the strongest permanent magnets on the market today. Neodymium magnets have many uses from a variety of industrial applications to an unlimited number of personal projects. They can be used in the manufacturing of motors alternators and actuators and also great for crafts school experiments and DIY jobs. Use for practically any light medium or heavy-duty project where super strong pull force is required. Diameter: 0.472 In. Thickness: 0.118 In.