FINDMAG 40 x 20 mm Magnet, 45.3 kg Pulling Force Strong Magnet, Fridge Magnets, Neodymium Magnets, Magnets Strong Large, Magnets for Whiteboard, Permanent Rare Earth Magnets for Multi-Use (Pack of 1) :
Strong Neodymium Magnets | Buy Online! – Magnet UK
Super-strong neodymium magnets crushing a man's hand - YouTube
Shaw Magnets - Large Ferrite Magnets - Blocks - 50mm - Pack of 20