The Econo-Cage Disposable System has only two parts to handle, the cage top and the cage bottom. Now that?s simple. A seamlessly integrated diet unit and cage top provides excellent visibility and reduced overall handling. Made from precision injection molded polypropylene plastic, the Econo-Cage? is available standard or irradiated. For customers already using our_Super Mouse 750__cages, the Econo-Cage? is designed to work with the racks you already have. And if you?re using Hydropac?, the compatibility is already built in with the only disposable system that gives you complete control over the cage environment and water quality.