Highly skilled foundry workers use the completed patterns to manufacture sand or ceramic molds. These materials are required to withstand the high temperatures of the white-hot molten metal when the complex casting process takes place. Some permanent metal molds are created and used for producing high volume items. Parts are cast in a wide variety of metals including aluminum, copper and cast iron alloys. Using modern foundry equipment, these metals are formed into the highest level of precision custom work possible. As each casting is broken out of its mold, the first level of cleanup and quality control is performed. This includes removal of gates, runners and flashings. Pieces do not leave the foundry until they have passed the strict inspection of the foundry's quality control team.