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ONE lot of 4 Magnets. Size: 1/2 inch diameter spheres Nickel (Ni) Plated (silver-like shine) Grade: N48 - Extremely powerful magnetic material These cylinders are axially magnetized, and feature North and South poles similar to the Earth's magnetic poles. These magnets will connect to form long chains. The metal coating is durable, but ALL Neodymium magnets can chip or shatter. If used gently, these magnets can serve you for a lifetime.