NATURAL MULTICOLOR STONES: These rocks are naturally unpolished for a smooth effect, and come in a natural variety VERSATILE USES Add extra beauty to your flower pot or home aquarium. It is perfect home decoration and creative indoor and outdoor design, helps you keep all your decorative spaces clean and beautiful How many stones do you need?: For fish tank with L length and W width, 1 inch stone layer thickness need L * W / 23lbs of stones . For example for a 10" x 10" tank, a 1" layer of stone would need 4.35 pounds of stone. Texture Alternative: Use gravel mulch indoors or outdoors in indoor or outdoor garden beds, helps soil retain moisture, provides good drainage, It is circular and on the feet as there are no sharp edges. They are long lasting and will not deteriorate like sawdust. International products have separate terms, are sold from abroad and may differ from domestic products