Ideally Suited for windows stylish, functional & versatile system, for ultimate protraction from insects. A major advantage of the system is screen is out of sight and protected when not in use. It can be mounted inside or on the surface of window frame. It serves you only when you need a screen and simultaneously the screen is cleaned every time you operate. Roller Window Screens are a simple and effective insect screens that roll into an attractive, sleek housing when not in use. Pulling the window screens into position when desired and retracted into the housing for safe storage makes it the most versatile system available. Window Screen Material can be installed on any type of existing frame. 100% Polypropylene Dual weather stripping to seal the screen fabric inside the aluminum side tracks and top profile.