100% natural sand. No additives, no dyes. Perfectly absorbable by most reptiles. Increases calcium intake, helping to reduce intestinal impaction problems when animals ingest the substrate. Excellent substrate for bearded dragons, Uromastyx, monitor lizards, geckos, land turtles (Geochelone, etc.), and many other species. Available in 6 colors in 5 kg or 2.5 kg.