Stuck trying to choose between the beauty of wood and the low maintenance of steel?  These doors are the perfect hybrid.  There are variations amongst make and model; however, the majority of these doors have a similar construction type-  3 layer steel doors with a composite overlay.  The face of the door is steel, interior insulation, and steel backing.  Then, there are one or two layers of wood composite adhered to the face of the door to provide depth and detail.  All in, this is a solid 4-5 layer product.  Other overlay options are steel and fiberglass.  With each manufacturer averaging 10 door design and 10 window design options, you have the opportunity to create a fully custom door.