Endura Flap Pet Doors for Walls are manufactured in the USA to be flexible, safe, and energy efficient in all climates. The translucent, dual-pane flap seals tightly against the weather using a patented system of magnets. This door has a single dual-layered flap on the inside frame for energy efficiency. When closed, the flap reduces air conditioning and heat loss and withstands winds up to 50 mph. Each unit permanently installs into your wall, up to eight (8) inches thick and includes a locking security panel. Comes with: Interior frame with flap and exterior frame, aluminum wall tunnel, security panel, mounting hardware and installation instructions. The are available in three colors: White, Black and Tan. 15 year warranty! Size: small.