n utility stainless steel. Reason being is that auto glass never scratches. It gets ROCK CHIPS. That way no worries. It's so irresponsible of apple to release a product that has glass that scratches. Scientifically, it's hard to scratch glass in its natural state. Metal is hard to scratch as well if the paint is thick and good quality. In Dubai Lexus uses paint that can withstand keying, rock chips, etc. it's lead based but excellent and durable. The metal needs to be like our refrigerators and microwaves. Nice stainless steel. Then i will respect the "legendary" apple more But if you think of it. More broken phones means more profits. So I'm not surprised. Thanks apple.