【NATURAL WHITE STONES】: These white river rocks are natural lightly polished for smooth effect, comes in a variety of natural shapes and sizes(About 1" to 2"). These Rocks are natural and as a result some may be broken or out of shape, oval or round, thick or thin.【MULTIPLE USES】: In flower arrangements, walkways, water features, exposed aggregate flooring or walls, around swimming pools it could also be used to as an accent to an aquariums, water gardens, ponds, and terrariums. Add an extra beauty in your garden or just outside your house. This is a perfect home decor and a creative interior and exterior design ,helps you keep clean and nice all of your decoration places.【How Many Stones Do You Need?】: For a fish tank with length of L'' & width of W'', 1'' thickness of stone layer needs L * W / 23 pounds of stones. E.g. for a 10''*10'' tank, 1'' stone layer needs 4.35 pounds of stones.【ALTERNATIVE TO MULCH】: Use indoors or outdoors，Pebble mulch in interior or exterior garden beds, helps soil retain moisture, provides good drainage, round and soft easy on the feet as there are no sharp edges. They are long lasting and will not deteriorate like mulch does.International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.