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N50 Neodymium Ring Magnet - 8.16mm O.D x 3.5mm I.D x 4.3mm thick c/w 6mm dia x 0.8mm Outer Step - 2.64lbs Pull
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CMS Magnetics® Grade N52 Super Strong Neodymium Magnet Ring OD1.26" x ID 1/2" x 3/8" - Rare Earth Magnet Ring for Classroom, Science Project and DIY Applications - One Pack: Amazon.com: Industrial
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