Aluminium window 1) elegant fashion and European style. European standard u groove, three rubber slots enable better water proof and air tight, and available in any sizes as per your needs 2) surface treatment & color: powder coating, anodizing, pvdf coating, electrophoresis, mill finished, wooden coating, etc, and all colors depend on buyer requirement. 3) window frame: aluminum wall thickness: 1.4mm 4) good air tightness and water / wind resistance 5) glass: double (5mm+9a+5mm)or single glass 6) hardware: made in china, of high quality 5 mm form layer+pearl foam+hardcardboard or according to your requirements.