There is a cage on the inside. A 10 point I think. I can see how this would tie the top together at the core, shock tower mounts, and the firewall if a bar is ran to each side. I was really thinking of replicating this to really tie everything together and to decrease flex at the shock towers. I have a 10 point cage, torque box, subframe connectors, and a core brace, so I'm really aiming for tight.