The magnet has strong magnetic force and stable magnetism; the main material is rare earth neodymium iron boron material, and the surface coating is usually white zinc color-silver nickel color-black nickel color; this type of magnet has a variety of round shape specifications, with a diameter of 10mm-15mm-18mm-20mm-24mm and thickness of 1mm-1.5mm-2mm-3mm, etc.; the specifications and thickness introduced are the main bulk orders produced by the factory for many years.