Atlantic Stone Source 2285412PC 4" x 12" 3cm Tundra Bullnose Tumbled Coping - Pool copings in natural stone come with the convenience of high quality and easy installation. They have a tumbled surface, and this makes them ideal for pool edging and stair treads. Natural stone materials present variations in color, finish and shade. This is expected with any natural stone products and it is what makes this product unique.