DFW Coping PC112BNCISG 13" x 13" Light Gray Bullnose Inside Corner Coping - Coping provides a smooth surface and acts as a great finishing accent. It covers the pool's concrete edges and prevents water from getting behind the pool shell and walls. The finish is perfect for outdoor pools leaving a softer look and feel around your pool. DFW Coping, one of the largest and oldest manufacturers of precast concrete pool coping in the US, has been producing hand crafted coping for over 50 years.