The “U” series is a through-body porcelain with textured surface (Rated R11). “U” is available in 6 stock colors in 12 x 12 and 12 x 24* size with 3 x 12 surface bullnose. For projects that meet minimum quantities, there are three non-stock sizes (6 x 6, 18 x18 and 12 x 24) that are available in the six stock colors. Additionally, in non-stock is a 12 x 24 size with a Brushed finish that is rectified, and a special Curry color with an extra abrasive finish that is available in 6 x 6 size only. http://www.tile-shop.com/products/you/you.html