Proline Decorative Concrete Systems CS350F 20"x 44" Cut Stone Cobble Thinflex Concrete Stamp. The beautiful look of Old World Cobble offered in a cut stone version, with its own unique background texture. What a lovely accent to any area in your home. Proline offers precision fit, a lighter stamp and a distinctive look. Cobblestone range in size from 5.5 Inch x 5 Inch to as large as 5.5 x 8 Inch in a running bond pattern. As with all Proline patterns, this stamp is offered in a thin flex for edges, against walls and walkways. Combine this stamp with any of our Border Art or Band Tools for a truly unique impression.