Joinery from synthetic materials has gained popularity in the last decade, as it is distinguished by its long lifetime and non-demanding maintenance. Constant research has contributed to development of high quality materials and to incorporation of steel strengthening profiles, which increase static stability of the product. Our windows are made from profiles of leading European manufacturers from Germany (Koemerling). In their labs they developed special materials on the basis of processed PVC, which are resistant to UV rays, so they prevent aging and changing of colors.