Namsan pet 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 12"x 14" and 14 "x 16" outer size. Suitable for medium or large dog using.