I love these little magnets! They're small, but strong. They can hold several pieces of construction paper together to my fridge. My daughter loves them because she loves to display her art work from school on the fridge. And they're super cute. Probably gonna buy some more soon.
We have a few metal boards in our house (from Ikea) for the kids to hang their artwork on. These are wonderful magnets for that. They are strong enough that a single magnet will hold up any paper art. In fact, I was easily able to place a pair of scissors on one of the magnets without it sliding down just to give you and idea of the strength (note: I'm not suggesting you use these as hangers - if you don't place the scissors on the the magnet gently it will slide down a couple inches).
Of course though, do keep these away from really young kids - eating magnets can be very dangerous.