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CMS Magnetics Neodymium Ring Magnet Grade N52 OD 1.26 x ID 1/2 x 1/4" Thick Rare Earth Magnet Ring. One Piece for School Science and DIY Projects: Amazon.com: Industrial & Scientific
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Amazon.com: Super Strong Neodymium Magnet Ring 1.5" OD x 3/4" ID x 3/4" N42 : Industrial & Scientific
CMS Magnetics Neodymium Ring Magnet Grade N52 OD 1.26 x ID 1/2 x 1/4" Thick Rare Earth Magnet Ring. One Piece for School Science and DIY Projects: Amazon.com: Industrial & Scientific
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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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Super Strong Neodymium Magnet N48 2OD x 1ID x 1/8" Permanent Magnet Rings, The World's Strongest & Most Powerful Rare Earth Magnets 1 pc : Industrial & Scientific - Amazon.com
Applied Magnets® 1 Piece 3" OD x 1.25" ID x 1" Grade N45 Neodymium Ring Magnet: Amazon.com: Industrial & Scientific
