These rectangular magnets are strong, made of a ceramic material,and have a unique alignment to them. Imagine a loaf of bread that has a north pole on one end and the south pole on the other. Once the loaf is sliced, the individual pieces of the magnet will still have the north pole on one end and the south on the other. You will need to use a compass to prove this point. It takes a minute for the kids to adjust their thinking from the traditional bar magnet image.
Demos and Labs: Finding Ferrous Materials, Simple Motor,