RaceQuip SFI 27.1 Rated Ribbon Window Nets are constructed of heavy-duty 1″ polypropylene webbing and nylon thread for maximum durability. RaceQuip utilizes a jig-built construction technique to ensure consistent size, shape, and fit. This auto racing window net is a very unique size (18″ High X 18″ Wide) and satisfies many applications where a custom racecar window net would be needed. SFI 27.1 certified and available in black.