The steel pigs are for a more long-term, long-life application than standard polyurethane foam. The pigs consist of a mandrel body with replaceable sealing cups and discs. The steel pigs can also be equipped with abrasive brushes and blades for cleaning and removing deposits on the interior pipe wall. The advantage of steel pigs is the ability to replace the wearing components, rendering it a new pig. Individual specification sheets, found within each product classification, outline the different types of applications and options. Most pigs can be manufactured with various design options including, adding or substituting accessories, adding gauging plates, as well as customized sizes - diameters, lengths, and other configurations for special pigging applications.