Recently bought my Iphone 7 matte black. It went straight into a case after the purchase and yesterday when I was removing some dust trapped in the case, I discovered the antenna bands are full of micro-scratches. Just wondering some of the following questions on the iphone: 1. What is the antenna bands made of? 2. Did this issue came up when iPhone6 came up with the white antenna bands? 3. Are any matte black users facing this problem too?