An ferrite magnet is a ferromagnetic metal oxide. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite also show high magnetic conductivity at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high frequency weak electricity. A non-metallic magnetic material is a composite oxide(or ferrate) of iron oxide and one or more other metal oxides. The magnetic force is usually 800-1000 Gauss and is often used in speakers, horns and other devices.