Description 2pcs N35 40x10x4mm Strong Block Magnets Countersunk Rare Earth Neodymium Magnets with 2 Holes 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 magnet 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 in room temperature the maximumoperating temperature is 80C and it never will demagnetization Specification Shape BlockMaterial NdFeBGrade N35Coating Nickel Ni Color SilverQuantity 2pcsSize 40x10x4mm2 Hole Eachhole 4 mm Applications 1 Acoustic field the speaker receiver microphone alarm stage audio car audio and so on 2 Electronics permanent magnetic actuator vacuum circuit breakers magnetic relays meter meter sound meter a reed switch sensors 3 Electrical field VCM CD DVD ROM generators motors servo motors micro motors motors vibration motors 4 Machinery and equipment magnetic separation magnetic machinery 5 Healthcare MRI scanners medical equipment magnetic health products and so on 6 Other industries magnetized Wax pipe descaling magnetic fixture automatic mahjong m