Extra long size: You can cut according to the actual size and shape of the dog door. Safe and Durable Material: Dog door flap is made of high-quality PVC, which is environmentally friendly and durable. After strict testing, it does not contain harmful substances and is safe for pets. It is waterproof, tear and scratch resistant, weather resistant, and easy to clean. Transparent material: The dog house door flap is transparent light blue, which is easy to observe outdoors and prevents pets from missing the door position. It is lightweight and flexible, making it easy for pets to enter and exit freely. Easy to install: First, you need to cut the plastic vinyl strip of the dog door according to the required size, then drill 2-3 holes on it with an electric drill, and finally screw the screws onto the top of the dog door to complete the assembly. Note that for better wind insulation, please overlap by 0.04 inches. DIY dog/cat door: Can be cut and installed in a suitable size on the door, suitable for various animal house. It is warm in winter and cool in summer, creating a comfortable environment!