Brand new still in box never used the Ideal pet door for cats and dogs. This pet door is the size small 5”X8” flap size for cats and small dogs. This pet door is very easy to install with detailed instructions on the back of the box as pictured. This pet door is thought and durable it’s impact resistant. This pet door is adjustable to door’s thickness. And it’s paintable to match house or trim. Also has a lifetime warranty. This pet door is perfect for your fur baby they will love using it.