You don't need to read a warning label, or even know of the special medical threat of swallowed magnets to think this 'toy' was a bad idea for a small child. Would you give a toddler a box of completely inert culinary grade stainless steel BBs to play with? Of course you wouldn't. Your kid could eat them and shit them out to his hearts content, but he still might chip a tooth trying to bite them and even if he were toothless why would you give a kid even harmless metal balls? They're just going to wind up stuck in his nose or something. Nobody gives inert glass marbles this small to young kids. It's a bad idea all around even discounting the unique threat magnets pose. Which is probably why there are very few confirmed cases of kids actually eating these magnets.