Cover Magnets 1 7/8" X 7/8" X 3/8" Ferrite Magnets Pack of 2. Material: hard ferrite magnet grade 8. Gauss Rating: 3,850 Gauss Surface Gauss: 1300 Gauss Pulling Force: 4 lbs. Pole Orientation: Magnetized through 3/8", Black = North, Red = South Application: magnetic therapy Note: All magnets are fragile and may chip or shatter. Handle with care and they will last forever. Keep them away from pacemakers and children.