Before selecting magnet magnet decide which one should be clear what the role required a magnet? (Magnet) a major role magnet: a moving object, fixed object or lifting objects. The desired shape of the magnet: disc-shaped concave magnets, circular cylindrical magnet, box-shaped, tile-shaped or special shapes. Size required for magnets: length, width, height, diameter and tolerance and so on. Required suction magnet, expected price and quantity and so on. Magnetic compass is based on the nature of the invention. Is defined mainly has the following three performance parameters to determine the performance of the magnet: remanence Br: permanent magnet magnetized to technical saturation, and after removal of the external magnetic field magnet, the reserved Br called remanence. Coercive force Hc: the magnetization to technical saturation of the permanent magnet B is reduced to zero, and the need to increase the reverse magnetic field strength is called magnetic induction coercive force, referred to as the coercive force energy product BH: represents the magnet gap magnetic energy space (magnetic two poles space) established by the density, i.e., the magnetostatic energy gap per unit volume. As this energy is equal to Bm and Hm product of the magnet, so called energy product. Magnetic field: The magnetic pole magnetic interaction space for the magnetic field. Surface magnetic field: the magnetic induction of the permanent magnet surface to a specified location. Diamagnetic diamagnetic are some categories of substance, when in the applied magnetic field, will have a magnetic field generated by a weak repulsion of a magnetic phenomenon. Paramagnetic paramagnetic, refers to a material's magnetic state. Some material may be affected by external magnetic field generating means characteristic with opposite magnetization vector. Such a substance having a positive magnetic susceptibility. And paramagnetic contrast the phenomenon known as diamagnetism. Male magnet, Guangdong magnet, new Tong Xin magnetic provided by the Dongguan City, Tong Xin magnetic Limited. Xin Tong, Dongguan City, the new magnetic Limited (www.dgxtxmagnet.com/) strong, credible, in Dongguan, Guangdong magnetic materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the new Tong Xin magnetic and you hand into the brilliant, for a better future!