 What are these materials? I mean, other than the aluminum, it looks to me like it's some type of glass. Well, it depends. There's different ports. Okay. What people really like is the polycarbonate roof. Okay. A polycarbonate roof is a high-tech plastic. Yeah. It's used for other things like contact lenses. Eyeglasses. Eyeglasses, airplane windows. So it's a plastic, but it's super, super strong. Right.