Super Strong N52 Neodymium Magnet 4 x 1/2 x 1/2" Block, The World's Strongest & Most Powerful Rare Earth Magnets by Applied Magnets: Amazon.com: Industrial & Scientific
Deago 40x20mm Super Strong Neodymium Rare Earth Disc Magnet, Permanent Magnet Disc, N52 Most Powerful Round Magnets - One Piece - Walmart.com
5/8 x 1/4 Inch Strong Neodymium Rare Earth Disc Magnets N52 (10 Pack) for Sale | totalElement