■ 56mm bounding box structure depth, unique composite manner material resistance to wind load resistance and shock resistance stronger;

■ international trendy tilt dump scheme, open safe, easy-to-use, easy to tilt the ventilation, the standard German ROTO hardware system, comfortable feel, surprises;

■ profile indoor wooden part of the standard American White Oak, with environmentally friendly water-based coatings mashi, magnificent nature, ecological health;

■ outdoor solid colored aluminum alloy, with Akzo Nobel powder coatings, beautiful, rich Corten optional;

■ 31mm sash notch width, standard 5 + 15 + 5 insulating glass, insulation and energy saving, Soundproofed meditation;

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