Bykes 30 Neodymium Magnets Super Strong Rare Earth Magnets Refrigerator Magnets - 1/4 x 1/4 x 1/16 inch Square N48 Size: 1/4 inch x 1/4 inch x 1/16 inch thick Square . Nickel (Ni) Plated (silver-like shine) - Axially magnetized Grade: N48 - Extremely powerful magnetic material Pull Force is approximately 1.5 pounds under ideal conditions. 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. MAGNETS ARE BRITTLE. BROKEN MAGNETS ARE SHARP. MAGNETIC MEDIA AND ELECTRONIC EQUIPMENT HAZARD. KEEP AWAY FROM PACEMAKERS AND INTERNAL MEDICAL DEVICES. MAGNETIC MATERIAL IS REGULATED FOR AIR TRANSPORT.