These strong magnets sold by Amazing Magnets are made of compound of neodymium iron and boron (NdFeB). NdFeB magnets are the strongest type of permanent magnets available. Generally used in industrial applications due to their extreme strength they have also have proved to be very useful for many other day-to-day applications requiring extremely strong magnets. Available in a wide variety of shapes and sizes these strong magnets are a perfect solution for your ultimate holding requirement. Extreme care must be exercised when handling these magnets, as they can easily pinch fingers, and cause extreme pain if mishandled.