AOMagnet neodymium rare earth magnets are up to 10x stronger than their ceramic counterparts. In addition, AOMagnet.com neodymium magnets are triple plated (Nickel) for maximum durability and protection against corrosion. Neodymium magnets are brittle, and will break or chip if allowed to slam together. However, if used gently, these magnets will last for a lifetime. SAFETY WARNING: VERY STRONG MAGNETS. KEEP OUT OF REACH OF ALL CHILDREN. THIS IS NOT A TOY. DO NOT INGEST OR INHALE. DO NOT PUT IN NOSE OR MOUTH. SWALLOWED MAGNETS CAN STICK TO INTESTINES CAUSING SERIOUS INJURY OR DEATH. SEEK IMMEDIATE MEDICAL ATTENTION IF MAGNET(S) ARE SWALLOWED OR INHALED.