The Tri Tunnel is a piece for the corner of your house. It has a 24 x 24" base with two legs on it, the short leg is 18" tall, the back leg is 30" high. Between the legs rest a cradle shaped bed for laying, under that bed is a small tunnel that has a 9 inch inside diameter. On top of the tall leg is a roomy large tunnel that is 18 inches long and has a 13" inside diameter. Fully carpeted inside the tunnels. Approx. 45 inches to the top of the large tunnel. Comes in neutral color unless specified. ASSEMBLY REQUIRED. Instructions and hardware included.