BYKES 20 Neodymium Bar Magnets Strong Magnets Refrigerator Magnets Super Strong Rare Earth Craft Magnets 1/2 x 1/4 x 1/4 inch Bar N48 Size: 1/2" long x 1/4" wide x 1/4" thick bars Nickel (Ni) Plated (silver-like shine) Grade: N48 - Extremely powerful magnetic material Set of 20 Magnets - Magnetization: Through Length 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.