polymer material however those having ordinary skill in the art will appreciate that the contact surface 46 may be constructed from any material and may include several other elements such as barbs or apertures to facilitate engagement between the trim panel component 30 and the trim panel substrate as noted above the trim panel assembly 10 includes a substrate generally indicated at 52 the substrate 52 includes a first side defining an a side surface 54 that is visible from the interior 16 of a vehicle 12 when installed to a vehicle door 14 as well as a second side defining a b side surface 56 that is concealed from the vehicle interior 16 the a side surface 54 may incorporate a pattern or texture often simulating the grain of leather imposed thereon by the surface of the mold cavity 44 from which the substrate 52 was formed the substrate 52 has a predetermined shape and thickness which also corresponds to the form of the mold cavity 44 from which it originated and may be manufactured from several polymer or composite materials commonly known in the art by way of example the molded substrate 52 may be manufactured nylon polypropylene tpo or pvc or acrylonitrile butadiene styrene abs or other rigid forming polymer referring to fig2 4 the substrate 52 is injection molded and is the form by which all of the trim panel components 30 are joined to create the trim panel assembly 10 of the present invention according to the present invention.