The EZ Mount Quad Stack are an extensions of our original suction cup window sill beds. Mounts to interior glass patio doors and large windows: Quad requires windows that are 24in X 57in, Designed with sturdy suction cups and a steel frame, Multiple levels to explore and perch, Each level has a super soft fleece sleeping area that is 23in x 12in, Shelf covers are removable and can be machine washed, Folds up to window so blinds and drapery can function normally (if kitty lets you), Can accommodate multiple cats-rated for up to 50 pounds, the Quad has 4 levels for a bird's eye view, Installs easily with no tools required. WHAT'S INCLUDED: Window Sill Unit, Push-n-Turn Suction Cups, Giant Suction Cups. DETAILS: 55" x 23" x 12", Weight: 6.75 lbs., Fleece, Nylon, Steel, Manufacturer's 1-year limited warranty. For warranty information please click here - https://cs.kohls.com/app/answers/detail/a_id/140, Model no. 100544928. Size: One Size. Color: Gray. Gender: unisex. Age Group: adult. Material: NONE.