The aluminum bulkheads are designed to join the lower framework plate and battery pack tray together in a durable, effective, and lightweight design. The bulkheads offer optimal stiffness, flex and managing faculties, even when using harder foam tires. The bulkheads are CNC-machined from premium Swiss 7075 T6 aluminum to give you the lightest & strongest framework for the car. The bulkheads feature a striking titanium color.