40mm x 20mm x 5mm thick +/-0.1mm tolerance Each magnets north and south pole are on opposite 40mm x 20mm faces Excellent resistance to demagnetisation Each magnet is coated with three layers of nickel, copper and nickel to improve corrosion resistance and provide a smooth and clean finish This magnet is smaller than a block of post-it notes but still produces an astonishing pull. These magnets are so strong that they will wipe data from hard drives and are commonly used in large scale engineering projects. Each magnet is coated with three layers of nickel, copper and nickel to improve corrosion resistance and provide a smooth and clean finish. These magnets come with a safe-handling warning; because they are so powerful they can be dangerous if not handled carefully.
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