NPT PC:3 CM X 12"X24" HZSMPC 3cm x 12" x 24" Haze Sandblasted Marble Bullnose Coping. Whether creating a patio, a walkway, or a pool deck, NPT natural stone hardscapes are the perfect fit for your pool area. Our Bullnose coping provides a smooth surface and acts as a great finishing accent. The rounded edge finish is perfect for outdoor pools and decorative landscaping. This type of coping leaves a softer look and feel around the pool.