Perspect windows without protection/back box, and the products are non-corrosive and UV stabilized in accordance with the outdoor environment with IP65 waterproof rating. Components like hinged lid spring, facial screws are manufactured from 316 stainless steel and will be resistant to corrosion due to weathering. The material used comply with RoHS requirement. Different sizes are avalable: 82*9117*157, 147*187, 234*234 and so on.