These magnets are much stronger than a conventional ceramic magnet. Great for craft and hobby use. Please handle with caution! Neodymium magnets are very strong magnetically and also very brittle. It is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets can chip if allowed to "jump at" an attracting object. Measurements: 8mm diameter (0.31 Inch), 3mm thick (0.11 Inch). N35 Magnetic Strength CAUTION: KEEP OUT OF REACH OF CHILDREN. WARNING: Persons who are pregnant, wearing pacemakers, pacemaker defibrillators, insulin pumps, or electric insulin devices, should not use magnetic products. NOTE: Photo is not to scale, please check the provided measurements to ensure that you purchase the size needed for your projects.