We use American Kennel Club black steel enclosures, in your choice of 8 ft. x 4 ft. x 6ft. or 4 ft. x 4 ft. x 6ft. The enclosures come with a very durable waterproof "A-frame" top cover. We offer a variety of tunnel lengths as well, which can also have a canopy on top, if desired. In addition, we have a variety of dog and cat door sizes to choose from, that are installed through the stucco or walls of your home, and serve as the entrance into the Catio. The enclosures are attached very securely to a wood plank floor, that can be stained or painted as well. Rugs, cots, and hammocks can be added, too!