RaceQuip SFI 27.1 ribbon auto racing 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 SFI rated Funny Car window net fits an opening size of 22" to 18" high X 12" wide which is currently the most common size used on Funny Car style roll cages. Note that these nets require use of vertical window net mounting bars or a mounting kit specific to this style of net. SFI 27.1 tag affixed - available in black only.