Is it possible to make a ring-shaped magnet with the North and South Poles as inner and outer surfaces respectively or vice-versa? If yes, then how? - Quora
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Ndfeb Magnet Ring Od 40x20x10 (+/-0.1)mm Thick Strong Neodymium Permanent Magnets Magnetic Tube Precision 1-5pcs - Magnetic Materials - AliExpress
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The difference between motor magnetic ring and magnet | Ferrite magnet, Alnico magnet, Rare earth magnets
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