These cork backgrounds by Zoo Med are made from 100% sustainable natural cork from the cork tree. Pre-cut to fit standard size vivariums. Cork makes a great background for your habitat, it doesn't mold, doesn't rot, and looks great. What more could you ask for? The texture of the background makes for a perfect climbing surface and provides a nice rough surface to loosen those pesky stuck on sheds. Available in an assortment of sizes to fit most terrariums or for the very large tank, consider multiple panels pieced together. These cork panels are easy to cut with just about any wood saw.