The vinyl windows in the United Window & Door PRO Series New Construction are coated with an advanced Onyx black acrylic coextrusion for unmatched durability that resists peeling, warping, blistering, and flaking. The double pane glass, filled with Low-E and Argon gas, enhances efficiency. The fully welded frame and sashes not only allow for both top and bottom ventilation, but also tilt in for easy cleaning. The exterior boasts an Onyx black acrylic coextrusion, while the interior is made of white vinyl. The Teflon coated, stainless steel constant force balance system is corrosion resistant and ensures smooth and effortless operation. The weather-tight true sloped sill is designed to repel water more effectively than other drainage systems. For added security, the Nite locks prevent the windows from opening more than 2 inches. And with the dark fiberglass mesh full screen, you can enjoy ventilation while keeping insects out and maximizing visibility.