The Magnetic Sticker on Refrigerator is Single-sided Magnet

As we all know, it is not possible for magnet to have a single polarity. There must be an N pole and an S pole. Then, why is it that the magnetic sticker on refrigerator only has one side that is magnetic? This is because the magnetic sticker on refrigerator is a kind of special
Stanford Magnets has been involved in the R&D and sales of licensed Rare-earth permanent magnets, Neodymium magnets and SmCo magnets, ceramic magnets, flexible magnets and magnetic assemblies since the 1990s.

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