BYKES 10 Neodymium Super Strong Extremly Powerful Rare Earth Refrigerator Magnets 1/2 x 1/2 x 1/4 inch Square N48 Grade: N48 - Extremely powerful magnetic material Pull Force is approximately 6.1 pounds under ideal conditions. Nickel (Ni) Plated (silver-like shine) - Axially magnetized Size: 1/2 inch x 1/2 inch x 1/4 inch thick Square. WARNING: VERY STRONG MAGNETS. KEEP OUT OF REACH OF ALL CHILDREN. THIS IS NOT A TOY.