18 Pounds Pebbles Aquarium Gravel River Rock, Natural Polished Decorative Gravel, Polished Pebbles,Garden Ornamental River Pebbles Rocks, Mixed Color Stones for Landscaping Vase Fillers Weight: About 18.3 pounds. SIZE: About 0.59"-1.53". Ideal for home decor and a creative interior and exterior design: - Helps soil retain moisture helps you keep clean and nice all of your decoration places.