Sealing weather-strip seals the perimeter against air inflation and noise. Insulation core, custom fit, for maximum energy savings. 20 gauge all steel stile and rail construction, surpasses all other entrance systems for strength and durability. 24 gauge galvanized steel, finished for added protection. Epoxy Coded, galvanized Steel interior, and two coats of baked on finished, exterior. White Only (No painting required for the first year) Top quality sweep seals out weather-- Adjustable Thermally broken high dam threshold of composite construction, designed for maximum protection against moisture and air penetration.