Health Canada has issued both an Advisory and Recall on small magnet sets (adult puzzles, Bucky Balls) for the hazard of young children putting them in their mouth.for more information....http://healthycanadians.gc.ca/recall-alert-rappel-avis/hc-sc/2013/31619a-eng.phpand http://healthycanadians.gc.ca/recall-alert-rappel-avis/hc-sc/2013/29247r-eng.php