20mm dia x 10mm thick Ultra High Performance N52 Neodymium Magnet - 14.8kg Pull
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
3/4 x 1/4 Inch Neodymium Rare Earth Disc Magnets N52 (6 Pack)