The High Tech Pet Armor Flex Med Pet Door with Magnetic Closure for Doors and Walls is like no other pet door on earth. These ingenious magnetic dog doors/cat doors feature a revolutionary, patent-pending flap design that creates an airtight seal, providing the highest level of extreme weather resistance and energy efficiency. The innovative flap design is made of individual, interlocking segments, each precisely positioned by rare-earth magnets. The interlocking segments pivot relative to one another to provide the horizontal rigidity required to create and airtight seal while providing vertical flexibility making it easy and safe for your pet to use. These extremely high-quality High Tech Pet doors are designed to be the best made dog and cat doors on the planet, featuring heavy-duty aluminum frame construction, high strength ABS composite flap construction and all stainless-steel hardware. The pet doors are finished with the toughest industrial powder coat to look beautiful and work perfectly for years and years. Compared to the next best pet doors on the market, new Armor Flex pet doors represent a big step forward in quality, innovation and technology with lower pricing to give you, not just the best doggy door but, the best VALUE anywhere. Check out our door mount, wall mount and our ultra-high quality, double-glass, Low-E patio door mount models.