The NPT PC:5CM X 4"X12"BDSBMBNC is 4" x 12" x 5cm Bianco Dolomite Marble Sandblast Bullnose Coping. Coping provides a smooth surface and acts as a great finishing accent. It covers the pools 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.