Windows:Plastic contains the anti-ultraviolet raw material,making it longevity.
Protection Net:Reasonable structure,material is Polypropylene.
Nylon pulley:Designed by patent organization,it is of rolling friction when turning on or off, low resistance and easy opening and closing.
Return Spring:High-quality stainless steel spring,durable and rustless.
Pulley Accessories:Rigidity hard-drawn wire round steel,ensuring accurately opening.
Rigidly connected will not be stretched,the surface is treated by galvanization in case of rust.