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
50mm dia x 10mm thick N52 Neodymium "Strongest Grade" Magnet - 45kg Pull
Metal Test Magnet - 54 lb N52 Grade Neodymium Rare Earth With Handle