The Zilla Reptile Terrarium Bedding Substrate Bark Blend is a 100% organic, natural bark product that is perfect for any reptile or amphibian enthusiast. Made from natural bark and oven-dried to eliminate any potential pests, this substrate is light and fluffy enough to encourage natural burrowing behavior. The ideal bedding depth in an enclosure is 1 to 2 inches, so this substrate is perfect for most reptiles and amphibians.