Exo Terra Bahariya Black Stone Desert Reptile Substrate is a natural dark desert soil/sand mix can cover expansive enclosures, allowing creation of deep layers for burrowing species. It maintains all the benefits of the Bahariya substrate – chemical-free composition, excellent compaction when moist (to form tunnels and landscape features), and efficient odor control due to its mineral content. Ideal for multiple enclosures or very large tanks, ensuring you have plenty of substrate to achieve the desired desert landscape and depth. Available in Multiple Sizes