Applying a film to the sunroof helps block more heat from entering the vehicle. The price is per sunroof glass, and we only use ceramic film for the glass. We explain that since the glass is exposed to more sun and darkened, it can get hotter, which is why we only apply ceramic. If it gets too hot, it could crack, though we've never seen this happen personally. While we tint many sunroof glasses, we want customers to understand the potential risks. Again, we have never experienced this issue ourselves.