The Magnador is one of the best utility rigid-flap pet doors available. They are used in a variety of situations; screen porch enclosures, doors. storm and screen doors, walls and kennel situations. This highly versatile door is made of injection molded polypropylene for the flap and frame. This sturdy construction makes it ideal for hard use and pets with chewing tendencies. Flaps are replaceable, allowing for a long lasting install. These doors are not "self- framing" so when they are mounted in doors or walls, the customer must fabricate the cut through the door or create the "tunnel" when going through a wall.