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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MIKEDE 40X20mm Super Strong Neodymium Magnet, Powerful Magnet Disc Permanent Rare Earth Magnets - One Piece: Amazon.com: Industrial & Scientific