Forget about scratched doors and walls or late night trips to let your pet out. This door is suitable for cats or dogs up to 40 lbs. It installs easily into a variety of walls and doors and is less suited for installation in glass. For thick walls additional framing (not included) might be necessary. The frame is made of white, durable plastic while the rigid flap is see-through. The door has a weather resistant, self-closing magnetic flap and a lockable interior barrier. All Staywell products have a 3 Year Warranty. Product Measurements: Overall size: 13 7/8" x 11 1/2" Cutout size: 10 3/8" x 9" Max. Shoulder Width: 8 5/8"