contains magnetic paper which detects magnetic fields e.g. where the magnets are in phones, or electrical appliances, a few small rare earth magnets (chocking hazard. and 2 large 'rattlesnake eggs' magnets that make noise when they come together rapidly. great toy box to learn about magnetism and what materials are and are not magnetic as well what in our everyday life contains magnets. Recommended donation is 60p Cost to replace is £10