Why aluminum cases have become so popular Just like many other things vary in price, ??iPhone 6 ??? vary in price. There are low cost metal cases and there are designer ones that go for 70 dollars or more. Due to the professionalism and luxury that is associated with metal cases, anyone can afford one depending on the amount that one is willing to spend. One reason that metal cases have become very popular is their durability. Metal cases are better at protecting a person's phone when they drop or when a sharp object would have scratched the phone but instead scratches the case. It does not matter the environment, a metal case is suitable for any occasion. Aluminum is one of the metals that are used for phone cases. They are coated with crystalline oxide to make them tougher. protecting the phone better. This metal also goes through a process that is known as plasma electrolytic oxidation or microarc oxidation

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