The shielded type of inductors are designed and constructed specifically to contain the magnetic field inside their enclosure so that other nearby components are not affected. They are constructed by winding a coil of wire around an axial leaded structure and covering the core with a magnetic shield to prevent the magnetic flux from leaking. The main advantage of shielded inductors is their relatively low emissions compared with semi-shielded or unshielded inductors. Various companies such as Bourns (US), Murata Manufacturing (Japan), Wurth Elektronik (Germany), and Delta Electronics (Taiwan) provide shielded types of inductors.