About this article High quality material. The outer frame is made of durable polypropylene that is weather resistant and easy to clean. Long , UV resistance, high transparency, can prevent animal attacks and bites, tough moisture and wear. Easy to install. This cat door is suitable for brick walls, metal doors, wooden doors and PVC doors. Can be installed on doors and walls 2.5 cm thick. Low Noise: This pet door is very quiet. Easy to use and very gentle. It is very dense and prevents the flow of air, which makes it very suitable for winter. Simple and high quality design. The transparent cover allows animals to see through the door. The outer screen is waterproof, you can clearly see the movements of cats or dogs.