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N42 Neodymium Ring Magnet
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Ferrite Donut / Ring Ceramic Type Magnet, Size 2¾" OD, 1¼" ID, ½" Thick | eBay
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Magnetic Therapy Ring (Gunmetal Gray)
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N42 Neodymium Ring Magnet - 90mm O.D. x 64mm I.D. x 5mm thick - 35.94lbs Pull
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