5/8 Inch 16mm Small Round Ceramic Magnets Bulk Pack 144 Pieces strong for crafts and 1/8 inches thick. Need magnets in bulk? These small magnets bulk are used for all sorts of arts & craft projects, home & auto. The bulk round magnets are bulk ceramic magnets, so they are not made out of metal or plastic. Glue these round craft magnets bulk to the back of projects to make them magnetic. Warning: Small Parts. Small magnets if swallowed can stick together in intestines causing serious injury or even death. Not a toy. Intended for ages 6+