I've put these magnetic tiles to the test to see if they're safe. It says choking hazard right on the box with the recommended age, so I'm eager to see if I can figure out why.
Of course, magnet tiles are really fun to play with. I have this review of the best magnet toys right here and tiles are right on the top of the list: https://www.youtube.com/watch?v=Pvb0LOYIA-k
These are the Desire Deluxe Magnet Tiles and you can see the Magformers tiles in here as well.