In search of safe magnets to use in the classroom or in a children's environment? Hero Magnets to the rescue! Chunky size with magnets completely encased in plastic. Strong display magnets help you get, and stay, organized. Great for whiteboards, filing cabinets, fridges, and more. Total of 18 pieces, the Hero Magnets Bundle includes 6 each of 3 different magnets: button, blocks & rings.