Source N42 Neodymium Magnets Tube Hollow Magnet on m.alibaba.com
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MAGCRAFT® NSN0590 - Rare-Earth Ring Magnets
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Magnetic Tube Hollow Ring Magnets with Countersunk Hole - China Neodymium Magnet, NdFeB Magnet | Made-in-China.com
Tube Magnets - Neodymium Magnets - SuperMagnetMan
Hollow cylindrical neodymium magnets with side grooves - China Courage Magnet Manufacturer
Spherical Magnet Through an Aluminum Tube, Part 1 - YouTube