Description Proline brings the popular look of blue stone to the decorative concrete world. The ever-classic Ashlar Stone look dates as far back as the 12th century and is found in most western architecture. We offer a variety of background textures, including this classic Blue Stone. This stamp consists of a 2-part, with an A and B, stamp. Color-coded to reduce repeats, these quality mats are both heavy duty and tight fitting for a perfectly balanced fit. Stamp size 36″ x 36″. Price reflects package savings.