Required by most sanctioning bodies, these ribbon window nets from RJS are SFI 27.1 approved, and mount to the roll cage with the optional installation kit. Made from durable nylon ribbon in a variety of colors, they'll keep you safe and looking good. These nets are designed to keep you from being thrown from your car and debris from entering, in the event of an accident. R.J.S. gives you a choice of three different sizes, to best suit your racing needs.