Strong magnets are not for small kids and children must be supervised by adults at all times, when near or using the magnets. Keep away from pacemakers, cell phones, monitors, credit cards, or sensitive electronic devices. Careful handling - Always be cautious when using the strong magnet. since it could easily PINCH YOUR FINGERS! Always be aware of your surroundings and be cautious where you throw your magnet. Magnet Pull Force is based on ideal conditions and are for comparative purposes only. Surface conditions (round, dust etc,) and metal thickness greatly affect magnets capacity. The strong magnetic fields of neodymium magnets can damage items such as television, computer monitors, credit cards, bank cards, computers, diskettes and other data carriers, mechanical watches, & hearing aids. When handling Rare-Earth magnetic products that are very powerful and can accelerate a great speeds toward each other and ferrous material. You should always wear gloves and eye protection when handling strong rare-earth magnets. You should avoid having constant contact with magnets of any size and keep a distance of at least 3 feet to large magnets. Under no circumstances should you try to machine Neodymium magnets! These rare earth magnets will crack, shatter and create a flammable toxic dust. Neodymium magnets will lose their magnetic properties if heated above (140 C). All of magnets are plated with a thin layer of nickel, nickel-copper-nickel. This layer can wear down in the normal use of the magnet over time. Neodymium magnets can be fun and useful, but must always treat with care. Happy and Safe Magnet Fishing.