Key Characteristics Composition: They are an alloy primarily made of neodymium, iron, and boron (NdFeB). Appearance: They usually have a shiny, metallic coating, most commonly a triple layer of nickel, copper, and nickel, which protects the iron content from corrosion and rust. Shape: The magnets in the image are rectangular bar or block shapes, which are common for industrial, educational, and household uses. Strength: Neodymium magnets are significantly more powerful than traditional ferrite or ceramic magnets of the same size, allowing for a strong magnetic field in a small space. Physical Properties: Despite their metallic appearance, these magnets are brittle and can chip or break easily if not handled with care, especially if they are allowed to forcefully snap together.