... window delicate and gorgeous, High performance adornment , with the main part of thermal-break aluminum window frame,combining with the ... anti-corrosive, skimmed, flame retardant processing,adopted the German high strength glue sticking, make the lumber strength,anti-corrosion, ... and bright10.High strength and rigidity, durable, opening deft and agile, no noise11.The wooden frame and aluminum frame are ...