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
40mm x 15mm - 1.57in x 5/8in N52 Rare Earth Super Strong Neodymium Magnet Discs
One Piece of CMS Magnetics® Super Strong Neodymium Magnet Grade N52 3x1x1/4": Amazon.com: Industrial & Scientific
Strong N52 Neodymium Magnet 1.26 in OD x 0.5 in ID x 0.25 in Ring