Strong Disc Round Neodymium Magnet Note: Be careful fragile and clip hand， placed in a dry place， stored at room temperature!Neodymium (chemical symbol Nd) is element 60 on the periodic table. It is a rare earth metal and forms one of the Lanthanides series. When added to Iron (Fe) and Boron (B) (chemical formula Nd14Fe21B) the resultant magnets are the strongest magnets currently available. Neodymium magnets are sometimes known as Neo， Neod or NIB magnets.Neodymium magnets are usually coated Nickel-Copper-Nickel plating to prevent the iron from rusting.Neodymium block magnet was made of NdFeB， have strong magnetic performances and appearance does not rust， usually placed in room temperature， the maximum operating temperature is 80 ° C ， and it never will demagnetization.Please be care when break apart because Neodymium block magnet have strong Magnetism.Shape: Disc RoundMagnetic face: 10mm * 15mm (Dia. * Thickness )Plating: Ni-Cu-Ni ( Nickel )Material: NdFeBGrade:N50Color: SilverWeight: 175gQuantity: 20pcsTip:1， Strong magnets should Keep away from Ironware and some easily magnetized iron products， such as monitors， bank cards， computers， televisions， mobile phones and other2， Strong magnets should be stored in a dry， heated environment， and need to use of plastic， wood， cardboard， foam to separated and wrapped.3， Magnets might be interested in water meter ，Electric meter， gas meter and some metering equipment exist some inaccurate affect (Such as : if magnets placed near the meter， the meter will slow down)The magnet we will only be used for industry， not for toys， at the same time should stay away from childrenPackage include20 x Strong Disc Round Neodymium Magnets