Metal surface with black pebbled finish and mineral composition back. Underwriters Laboratories approved as a floor hearth pad, or can be screwed to a wall for heat protection. 40” x 48” We ordered this online for our wood stove installation but have since changed our plans and have installed a tiled hearth. Just under $400 from the supplier before taxes and shipping. Note: there’s a small dent in the surface which would probably sit unnoticed under a wood stove - see the photo. Thanks for looking.