Pretty sure everything in the Formula 1 cockpit is carbon fiber. Roll bar, body cage. I learned about carbon fiber when my son was 8 years old, now 50. CTI was making carbon fiber knee braces, the first ones for offensive linemen in the NFL and high ranked college football teams. They were cutting edge in the day. My son was sponsored by them, he raced motocross. He hurt his knee and they made a custom braces for him to compete in World Championships. It helped some, but the injury was to recent. But he wore them for his whole racing career. Pretty amazing stuff, and if you want to, you can do about anything with it. He had a Honda CR 80 in 1980 that had a carbon fiber fuel tank, sub frame, handle bars, triple trees. It was an amazing thing to see. Full factory Honda ride at 10 years old. The factory professional guys in the 125/250/500CC class were in total envy. Unfortunately I don't think I have a picture of it damn it..