Description: 20pcs N50 Super Strong Round Cylinder Rare Earth Neodymium 10mm x 15mm 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. Specifications: Shape: Disc Round Magnetic face: 10mm * 15mm (Dia. * Thickness ) Plating: Ni-Cu-Ni ( Nickel ) Material: NdFeB Grade:N50 Color:  Silver Weight: 175g Quantity: 20pcs Applications: 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 crane, magnetic machinery. Healthcare: MRI scanners, medical equipment,
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