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1-5pcs Ring Ferrite Magnet Out Diameter 60 80 90 100 120mm Permanent Magnet Hole24 32 40 45 Black Round Speaker Ceramic Magnet - Magnetic Materials - AliExpress
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Amazon.com: Ferrite Ring Magnets with Holes - 1.2 Inch (31mm) Round Disc Donut Magnets - Circle Hole Magnets - Perfect Ceramic Circular Magnets for Crafts and DIY : Industrial & Scientific
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