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ONE lot of 20 Magnets. Size: 1/4 inch diameter x 1/8 inch thick discs. Nickel (Ni) Plated (silver-like shine) Grade: N48 Extremely powerful magnetic material Pull Force is approximately 3 pounds under ideal conditions. These discs are axially magnetized, so the strong North/South poles are in the center of the flat sides. That makes them easier to stack into a cylinder than to connect side by side. The metal coating is durable, but ALL Neodymium magnets can chip or shatter. If used gently, these magnets can serve you for a lifetime.