3/8x1/16" Rare Earth Disc Magnets (40-Pack)Details: Rare Earth magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. These disc magnets are 3 8 in. Diameter and 1 16 in. thick. They are magnetized through the thickness. They are composed of grade forty neodymium iron boron magnetic material and are plated in nickel copper nickel for a shiny corrosion resistant finish. Their maximum working temperature is one