... Standard desription1): Aluminum alloy: 6063-T52): For glass: 5mm+9A+5mm insulating, 5mm+6A+5mm ... +9A+5mm+9A+5mm double insulating function glass. 6mm single glass.3): Frame finished: Anodic oxidation, electrophoretic ... Germany Siegenia, Hongkong Kinlong, Italian Glass.5): Glass type: Single glass, double glass, hollow glass, tempered glass are available.Excellent Performance1): Sound Insulation ...