... domestic aluminum alloy/ Top domestic CONCH PVC, famous brand, incombustible, resist bending and stress, service life ... Hardware system: High quality hardware, domestic top brand and imported German ROTO, SIEGWNIA. Product FeaturesAir-proof, Water-proof ... Glass, Low-E GlassHardware SystemChinese Brand (KINLONG) or German Brand (ROTO). Customers' stipulated brand is available.Seal SystemTernary ethylene ...