This set contains two stones, a large and heavy main stone and a smaller complimentary piece. The aquarium and sand are not included and only used to help position the stones and give size reference. The aquarium is about 11 gallons and 17.75 inches long and 12 inches tall. SubstrateSource Dragon Stones vary in form and coloration. The stones can have deep crevices and range in color from orange to brown to green. Every piece is unique. Take care when handling the stones as they can sometimes be brittle and fracture if dropped. Rinse before use.