The Rabbit Hutch Extension is constructed of untreated natural wood and is designed to fit the Wabbitat Deluxe Rabbit Home (model 158, sold separately). The Rabbit Hutch Extension provides the perfect safe haven for your Rabbit (or Guinea Pig) while providing your pet with a sense of privacy/security they distinctfully desire in the wild. The Hutch Extension measures 18″L x 23.625″W x 19.25″H, attaches easily with no tools required and features a secure lift-top door for easy access to your pet. We at MidWest Homes for Pets understand that your Rabbit, Guinea Pig or Small Animal is a part of your family and that’s why we ensure our rabbit cages are manufactured with the highest quality control standards creating a safe home for your pet that you can feel confident with. MidWest Homes for Pets stands behind the quality of our products with a 1 Year Manufacturer’s Warranty. If you have any questions about our dog crates our customer service department would be glad to help you. MidWest customer service can be contacted at: 1-800-428-8560, available 9:00 AM – 4:00 PM, Monday – Friday.