Proline Decorative Concrete Systems BW170-F 30"x 72" Random Boardwalk Gang Tool Thinflex Concrete Stamp. Proline manufactures the most life-like and beautiful wood planks in the market. This pattern consists of 6 Inch wood planks "ganged" together in a staggered pattern. Each stamp has five rows of 6 Inch wide planks. We suggest you include a "end cap" 6 Inch wide and 4 ft long, offered in both the rigid and superflex material. At the end of each plank there are two peg holes for added reality. This lovely pattern adorns the Polar Bear exhibit at sea world, San Diego. Use any of our beautiful water based acrylic stains and EZ-Tique water based antiquing system colors to add your mark of distinction.