Make sure this fits by entering your model number. Natural Polished Pebbles: These beautiful river stones are naturally lightly polished for a smooth finish and are available in a variety of natural colors for long-lasting beauty. The color of this river rock is natural, so it can include various shades of brown, black and white rock. (Rocks are natural, so some may be broken or deformed, thick or thin, oval or round) Versatile: Use in flower arrangements, vase fillers, walkways, water features, exposed gathering floors or walls, swimming pools and many other areas. It can also be used as aquariums, water gardens, pools and terrariums. Natural stone, river stone, fish tank gravel, aquarium gravel to add extra beauty to your garden or outdoors.