Silver series. 25-gauge steel bonded to a layer of 7/8-inch polystyrene insulation, creating a double layer door that is energy efficient. Quieter in operation than single layer doors. Tongue and groove section joint helps seal against weather and is easier to stack when installing. Aluminum retainer with a vinyl floor seal also helps protect your garage from the weather. Long-lasting nylon rollers. Includes interior locking mechanism, rails, and automatic opener reinforcement. Wood grain textured classic raised panel design. R-Value: 6.3. 25-year limited paint system warranty, 3-year hardware warranty.