AMERICAST ARCHITECTURAL STONEthin cast stone mantel surrounds create a luxurious focal point for any fireplace at a fraction of the cost of real stone. Our surrounds, hand-made in America, provide the rugged appearance of authentic stone along with highly detailed architectural design. Constructed from a combination of gypsum and fiber materials, our surrounds are noncombustible and do not shrink or swell with temperature or humidity changes ensuring a tight fit upon installation.