Zoo Med Eco Earth Compressed Coconut Fiber Expandable Reptile Substrate is a compressed coconut fiber made from the husks of coconuts. It’s an eco-friendly, renewable resource that can be safely composted or recycled into potted plants and gardens. This substrate is ideal for a naturalistic terrarium setups and great for all types of reptiles, amphibians, small animals or insects. Use it damp to increase humidity in an enclosure for tropical species. Each Eco Earth brick makes 7-8 liters of substrate.