The Bio-Basin is designed for customers looking to go bio-active. The Bio-Basin allows you to add a drainage layer and substrate without water seeping through the seams of your Zen Habitats Reptile Enclosures. Made of a clear, flexible, form fitted, plastic sheet, which fits perfectly in our 4’x2’ based Zen Habitats Reptile Enclosures. Simply lay the Bio-Basin into the enclosure and fill. Includes double sided tape to attach the Bio-Basin to the enclosure (if desired).