Ribbed Design The Ribbed Design may be specified in either of two surface options — an embossed orientation (darker tiles shown) for a more rustic, textured surface — or a debossed orientation, (lighter tiles shown) for a smoother, more “glassy” finish. Standard UltraGlas Colors Glass Edge Thickness: 5/16” Download PDF File of Catalog Page. Also See: MultiDot/Metal/Grid Rain Squiggle Woodrift