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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1/2 x 1/16 Inch Neodymium Rare Earth Disc Magnets N52 (50 Pack) - Liftsun Magnets Company
Neodymium Magnet Disk N52 D1″ x 1/8″(A) - Radial Magnets - We Know Magnets
10mm dia x 5mm thick N52 Neodymium "Strongest Grade" Magnet
N35 VS N52 Magnets | Stanford Magnets
N52 Disc Neodymium Magnet 25mm dia x 10mm 1pcs/pack