cat screen door is made of ABS material, sturdy and durable. Fix the door frame with screws to prevent the door from falling and make it more stable to withstand pet wear and tear. A door flap with built-in magnetic can keep the door automatically closed when your dog leaves. And it can be replaced at any time. Use the slide lock to control your pet’s access to the outdoors, preventing your pet from going in and out all the time. The inner size of the door is 8 “x 10.2” and 9.4 “x 11.4” outer size. Suitable for cat and puppy using.