Heavy-Duty Construction frame with Top 6063T5 Aviation Aluminum, 45°Cutting in Seamless Stitching.Double-layer Tempered Insulating Toughened Glass in Automobile grade for Sound insulation.Stainless Steel Wire Mesh in 304 or 316 , Anti-mosquito and anti-insect.With High Performance Concealed Casement Hinge-German Noto...