This RisiStone product is the weathered version of the StackStone® system and has all the same positive attributes, including tapered design, self-aligning structure, and durability. RomanStack® is manufactured through a specialized process that rounds off the edges and corners, and gouges the face. This gives the wall a worn cobble appearance that looks like real stone, not concrete. For more information visit risistone.com. For coverage information refer to page 110 of the product information guide.