Steel pigs are a more long-term, long-life pig. They consist of a steel mandrel body with easily replaceable sealing elements (cups and discs) and can be equipped with various brush types (spring-loaded, circular, wrap-around) for removing deposits on the interior pipe wall. Standard configurations include cup, disc, multi-disc, conical cup, and various combinations. Various options are also available, such as adding or substituting a cup or disc, special lengths and diameters, gauging plates, articulated joints, transmitter cavities, and magnet packs. The advantage of steel pigs is the ability to replace the wearing components (cups, discs, brushes, etc.), thereby rendering it a new pig.