Applied Magnets® 1 Piece 3" x 2" x 1" Grade N50 Neodymium Block Magnet: Amazon.com: Industrial & Scientific
Super Strong N52 Neodymium Magnet 3 x 1/2 x 1/4" Bar, The World's Strongest & Most Powerful Rare Earth Magnets by Applied Magnets: Amazon.com: Industrial & Scientific
One Piece of CMS Magnetics® Super Strong Neodymium Magnet Grade N52 3x1x1/4": Amazon.com: Industrial & Scientific