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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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Amazon.com: Applied Magnets ® 4" x 1" x 1/2" Neodymium Magnet Block : Industrial & Scientific
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