Neosmuk Rare Earth Magnets, Super Strong Magnet Heavy Duty for Craft, Neodymium Magnets with Adhesive Backing for Board, Thin Powerful Large and Industrial Magnets Stick for Cabinet, Refrigerator: Amazon.com: Industrial & Scientific
A Complete Guide to Rare Earth Magnets | Master Magnetics
Rare-earth magnet - Wikipedia
Rare Earth Magnets 5/8 in x 3/8 in Disc Neodymium N42