3mm neoSpheres are fully CPSA compliant. Designed below the ASTM "hazardous magnet" strength (Flux Index of 50), 3mm neoSpheres are nickel plated that are about half the diameter of U.S. federally banned 5mm magnets. Although neoSpheres are slightly weaker due to their size, the warning we have is the same: Keep them away from faces! Swallowed magnets may stick together across intestines causing serious injury or death. Keep away from children who don't understand this. Seek immediate medical attention of magnets are swallowed or inhaled.