Magnets can be generating a magnetic field an object, can attract ferromagnetic substances such as iron, nickel, cobalt and other metals. Magnetic pole judged by a thread hanging magnets, pointing to the north pole is called North Pole, pointing to the south pole as a S pole. Magnet pole is different attraction, with pole the exclusion. NdFeB (Neodymium magnet) with a high magnetic energy. Hard texture, stable performance, very good price. Application is extremely broad. Surface coating. Usage: Acoustic field: the speaker, receiver, microphone, alarm, stage audio, car audio and so on. Electronics: permanent magnetic actuator vacuum circuit breakers, magnetic relays, meter, sound meter, a reed switch, sensors. Electrical field: VCM, DVD-ROM, generators, motors, servo motors, micro-motors,motors, vibration motors. Machinery and equipment: magnetic separation, magnetic cranes, magnetic machinery. Health care: MRI scanners, medical equipment, magnetic health products and so on. Type: Magnet Material: NdFeB Quantity: 1Pc Grade: N52 Features: Cylinder Shape, Strong Magnetism, Multipurpose Size: 15mm x 20mm/0.59" x 0.79" (Approx.) Notes: Please place it to where children cant find, in case of eating wrongly. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Magnet