Xinaosi door and window series adopts national grade a high-quality primary aluminum 6463 aluminum rod, which is free of lead and mercury harmful substances; 5 + 24a + 5 Automobile grade 3C tempered glass not only widens the filling of aluminum spacer bar and molecular sieve, but also fills with inert gas argon to ensure better sound insulation, heat insulation and energy saving effect; all hardware accessories are made of aluminum oxide and zinc alloy, with high hardness and no pollution Easy deformation, no rust, long service life, smooth handle, ergonomic design of handle, perfect combination with frame, smooth opening and closing; diversified appearance design style, product injection of unique aesthetic perspective, creating space aesthetics with quality and attitude, specially designed for appearance control.