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12x3mm Strong Ceramic/Ferrite Silver Magnets in Disc Shape for Photo Gallery, Arts & Crafts, Refrigerator Magnet, Hobby, School Projects & Office.12mm (Diameter) x 3mm (Thickness) Neodymium Disc Strong Magnet is very useful for hanging or holding circular or disc-shaped metal objects as well as a wide range of other magnetic applications. Rare earth neodymium magnets, also known as NdFeB magnets or Neo magnets, are made from an alloy of neodymium, iron, and boron. They have excellent magnetic properties and are extremely strong for their small size. Neodymium magnets are permanent and have a high maximum magnetic energy. Due to the high ratio of performance over price, neodymium magnets have become extremely popular in almost all applications that require high-performance magnets such as motors, sensors, computers, communications, medical equipment, meters, home appliances, craft model, jewelry, and so on.