Give your cat a place to perch and climb that looks great in your home. This elegant wall-mounted cat tree looks like a book shelf in your house, and satisfies your cat"s natural instinct to be up high. The Sophia Cat Tree comes in a set of two pieces that can be arranged in various configurations. One piece has an opening for your cat to climb through and the other piece has a closed off area for decorative items; the other shelf is closed off to store decorative items Cat entrance hole is 7.5-inch wide by 8-inch. The Sophia Cat Tree is easily assembled, and comes with detailed instructions. For setup, you will need a Phillip"s head screwdriver, a drill, a hammer, and a pencil.