Very strong (N35-N40) super strong magnet square block with slightly rounded corners. Plated with nickel. The square is 1″ x 1″ and the thickness is 1/4″. N35=35 MGOe (Mega Gauss Oersted)= 3500 Tesla Warning: Gloves and goggles are required when handling these magnets. Neodymium magnets should always be handled carefully. Some that are slightly larger than the size of a penny are powerful enough to lift over 10 kilograms. Neodymium magnets can severely pinch skin or fingers, or even break bones when suddenly attracted to a magnetic object.