Gravels are one of the most important part of aquarium because they keep water fresh and healthy long and long time by absorbing all the waste they work as a good biological filter because most of the healthy bacteria grow between them they work as a great part in decoration. These provide a very healthy environment to plant and fishes. Shining glow pista green color stones (pebbles form) are available in 10kg pack, minimum 2. 5 Inch layer of gravels is very important for healthy aquarium. Features-1. Material marble2. Colour multi-color3. Dimensions 10 kg pack4. Package contents 10kg multi color pebbles.