The double cassette doors and balconies are made of retractable aluminum two-track sliding mechanisms. We utilize a unique bottom rolling wheel design to ensure that sliding screen doors and windows operate smoothly.Our sliding systems are a genuinely excellent product for windows, doors, and balconies. They have bigger apertures to enable sunlight and fresh air to flow, but are mesh-close enough to keep insects out. Excellent visibility, solid construction, and stylish design.
