After the original announcement of the iPhone 5, one early concern amongst readers was how well the anodized aluminum back and edges of the black iPhone 5 would hold up over time. One lengthy thread on our forums has been actively discussing the potential issue and Pocket-Lint in their review did note some wear around the edges after some early usage. One person on another forum got straight to the matter and took keys and a SIM card tray pin to the back and edges of an in-store iPhone 5 unit with these results. Of course, purposefully scratching a device is a bit extreme, but daily usage of any phone will generate some wear and tear. This may be a concern if you are particularly sensitive to the issue. Article Link: Black iPhone 5 Anodized Aluminum Susceptible to Scratching?