The Zoo-Med Naturalistic Terrarium Silicone Cover 40cm x 40cm is a simple tool that allows you to keep the humidity up in your enclosure by restricting ventilation through the mesh screen top. This product is designed for use with Zoo-Med's Naturalistic terrarium range. Multiple pieces can be used to cover larger enclosures and the item is easy to cut to shape if required. The Zoo-Med Naturalistic Terrarium Silicone Cover is made from non-toxic, high heat-tolerant material.