In neodymium cube magnets series, 20mm is one of the most popular big size which widely sold by magnet distributors. Because of the big size, it is super strong, one N45 neodymium cube magnet 20mm has strength of 25kgs. To make it easy to be took apart,neodymium cube magnets 20x20x20mm are delivered with thick plastic piece between every one. However care are still needed to handle such super strong cube magnets.
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