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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100mm Large Ndfeb Magnet Ring (+/-0.1)mm Strong Neodymium Magnets Tube Rare Earth Diameter 10cm 100x80x50 Mm 5cm Height Circle - Magnetic Materials - AliExpress
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Neodymium Ring Magnets 4 in OD x 2 in ID x 1/2 in Rare Earth N42
3" x 2" x 1" Neodymium Rare Earth Magnet Ring : Amazon.ca: Industrial & Scientific
Toroid Permanent Multipole Neodymium Ring Magnet - Magnets By HSMAG