Description 100pcs N48 7mm x 2mm Super Strong Disc Magnets Rare Earth Neodymium MagnetsNeodymium 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 magnetwas made ofNdFeB have strong magnetic performances and appearance does not rust usually placed inroom temperature the maximumoperating temperature is 80 C and it never will demagnetization Specification Material NdFeBGrade N48Shape RoundProduct Size D7 2mmarrow 0 2mm errorPerating temperature 80℃Note 7 agesQuantity 100pcsApplications Acoustic Field the speaker receiver microphone alarm stage audio car audio and so on Electronics permanent magnetic actuator vacuum circuit breakers magnetic relays meter meter sound meter a reed switch sensors Electrical Field VCM CD DVD ROM generators motors servo motors micro motors motors vibration motors Machinery and Equipment magnetic separation magnetic machinery Healthcare medical equipment magnetic health products and so on Other industries magnetized Wax pipe descaling magnetic fixture automatic mahjong machine magnetic locks doors and windows m