The TRUTH about magnetic tiles SAFETY

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.