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The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
Neodymium - This material is capable of storing the most magnetic energy, and produces the strongest magnets. It is a blend of iron, boron and the rare earth element, neodymium. Commercial gauss ratings are typically 10,800 to 12,300 gauss. Therion products use ultra-high grade neodymium magnets, rated at 13,800 gauss.