Number of pieces 12 Rare earth magnets are the strongest permanent magnets currently manufactured They are amazing in size powerful and versatile These disk magnets have a diameter of 126 inches 32 mm and a thickness of 012 inches 3 mmTolerance A02mm They are composed of grade N52 neodymium iron boron magnetic material and are plated with nickelcoppernickel with bright corrosion resistance The maximum operating temperature is 176 F 80 c Our neodymium magnets are usually used for creative applications such as DIY projects scientific experiments refrigerator magnets shower doors work or office scientific purposes handicrafts or school classrooms In addition because they have antidemagnetization properties they are ideal for shock absorption or damping when used to repel other magnets