Vets Best Cat Condo is a stainless steel unit that includes a shelf and a pass through to side litter box area. Unit is fully welded and constructed of 18 gauge 304 stainless steel and includes two heavy duty doors with one hand latch system. Can be stacked up to 3 high or may be used on a counter top. (A litter container is not included). Wheeled cart sold separately. (Casters not included). Litter box size needed is a 11.5" x 23.5". The litter box can be smaller, but not any larger.