windows and doors in a home are bronze rather than aluminum. an aluminum window frame fulfills its purpose, but the life of a bronze one can last two centuries and is very beautiful, shaughnessy is specialized in producing the bronze alloy profile, the detailed product description as follows: features: 1) easy to install 2) available in various sizes 3) high quality standards 4) long usable life 5) fire resistant 6) weather resistant 7) impact resistant 9) soundproof