N48 Neodymium Magnet Block 1 in x 1/2 in x 1/16 in - Applied Magnets - Magnet4less
Amazon.com: Super Strong Neodymium Magnet N48 2OD x 1ID x 1/8" Permanent Magnet Rings, The World's Strongest & Most Powerful Rare Earth Magnets 1 pc : Industrial & Scientific