NPT PC:5 CM X 24"X24" STTBNPC 24" x 24" x 5cm Classic Silver Bullnose Tumbled Travertine 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.