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. Big Blocks measure 2" L x 1" W x 0.50" T and hold 20 pieces of paper. Flip them over to see a different bright color. Each set includes 40 magnets in a display box.