Hanger doors, or "slabs," are typically made of a series aluminum rectangular frames, covered with alloy or aluminum skins.
At the bottom of the door base a series of bearing-suspended rollers are integrated within the overall structure. These rollers are capable of handling enormous weights; they are typically made of steel or other more exotic ferrous materials.
The roller assemblies ride in what are referred to as "tracks." These multiple structures are integrated within the concrete foundation and serve as roller guides, as well as creating seamless surfaces that the entire door assembly can move across.
Depending on the type of door design, one or more motors are installed on one or both sides of the hanger structure. These high-powered electrical motors are typically triggered by switches placed on either side of the building. The motors themselves are in turn integrated with one, or more horizontal arms physically connected to the door system. These components open or close the entire system on demand.