I don’t know about you but I love magnets. If you are looking for a strong magnet to use for your own experiments, you may want to give this one from Magneto Inc. a look. It is a N52 grade magnet with stunning 600lbs pull force. It measures 1.35×1.35×2.35 in.
The magnet has triple Ni-Cu-Ni coating for anti-corrosive protection.