Estes Aquarium Gravel Red Flint is a natural stone substrate produced for use in basic freshwater aquarium setups. Each piece is clear coated with a high-gloss, environmentally friendly resin that keeps the gravel virtually dust free and gives it a polished, long-lasting appearance. The red coloring adds visual interest to a tank while the gravel itself provides functional bottom coverage, helping to weigh down live or artificial plants and other decorations. The product is packaged in poly bags for easy pouring and even distribution across a tank bed. Rinsing the gravel thoroughly before adding it to an aquarium is recommended to remove any loose dust from packaging and shipping. This gravel line comes in multiple sizes and pack configurations to suit different tank volumes.