Copper wire with enamel coating is made by applying one or more layers of insulating material to various wires after they are dried. Self-fusing enameled copper wire is a special category, where the conductor is coated with two layers of material; the inner layer is an insulating layer, and the outer layer is a glue layer. The characteristics of self-fusing wire vary depending on the thickness of the conductor and the glue layer. It is mainly used in speaker coils, buzzer coils, micro vibration motor coils, hard disk drive coils, pickup coils, antenna coils, sensor coils, and Zhida electronic products.