This product is a pack of 12 N52 grade neodymium magnets in the shape of a cylinder with a disc size of 3/8" x 3/8". The magnets have a rating of N52 and are coated with nickel. The magnets have a length and width of 9.53mm and are .375 inches in size with a magnetic force of 10 lbs. They are made of rare earth neodymium and are suitable for various business and industrial uses, including fasteners and hardware.