Chicken pen/exterior run is designed to be attached to the chicken hut outdoor coop. Pen is 41" wide by 37" high by 54" long. It is made of 1" x 1" wire. There are hinged doors at the front and a side door with access to the chicken hut/coop. Coop and pen could also be used in a barn/shed to house special breeding groups or as your isolation coop.