10mm dia x 4mm thick N42 Neodymium Magnet - 2kg 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
What Is A Neodymium Magnet? - Bunting Magnetics Co.