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This is an Annular Ring shape Neodymium Magnet with Dimension 11 mm x 5 mm x 5 mm (Outer Diameter x Inner Dia x Thickness). Neodymium Magnets are a member of the Rare Earth magnet family, and are the most permanent magnets in the world. They’re composed of Neodymium (Nd), Iron (Fe) and Boron (B), which makes them vulnerable to rust if they’re exposed to the elements.