Granite tub surround /shower surround 3/8" thickness panels,Fiberglass reinforcing backing on the backside. Or Alumniumn Plastic inforcing backing Granite tub surround /shower surround 3/8" thickness panels Fiberglass reinforcing backing on the backside. Or Alumniumn Plastic inforcing backing The granite is cut into 3/8"(1cm) slab, and have backside adhesive with fiberglass net or alumnium plastic as reforcing backing. It is thin but strong, and reduce the weight of the building. It is as easy to install as puting glue on the wall evenly, then put the panel on it. The job is done.