Belgard 10502346 4" x 12" Dark Charcoal Marina Coping. Marina Coping features a smooth surface and can be used as a finishing accent for an array of outdoor living features, including pools, steps, seat walls, outdoor kitchen counters and foot ledges, and more. It covers your pool's concrete edges and prevents water from getting behind the pool shell and walls. This bullnose coping comes in our Dark Charcoal color.