aluminium: 1.aluminium extrusion for window and door 2.finish:powder coated, anodizing,electrophoresis,fluorocarbon Coating aluminium· Alloy: 6063, 6005, 6061· Temper: T5/T6· Colors: silvery white, bronze-colored, champagne, black, and others· Surface treatment: o Anodizingo Electrophoresiso Powder coatingo Mill finishingo Very good heat preservation and heat insulation