1.42-inch diameter and 1/4-inch thick strong neodymium magnets with a ring hole for easy hanging. These rare-earth magnets are made of super strong NdFeB material, with a service temperature of 80 degrees Celsius. The ultimate pulling force of each magnet is 120 lbs. The actual pulling force is affected by the distance between the two magnets, the thickness of the object being attracted, and whether the surface is flat or uneven. These heavy-duty magnets are ideal for industrial applications, home repair, office organization, school projects, craft making, DIY, and more. They are also great for use as refrigerator magnets or whiteboard magnets.