Replacing metal rim

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http://forum.xda-developers.com – I just dropped my phone from my desk top on the floor. Luckily floor was made of ceramic tile. No major dent or scratches. I had used barely there case cuz like the thinner profile. I didn't notice anything on the day I dropped the phone but today I noticed a little hair line crack in the rim just above the ear piece. I am little ocd about crap like this. I was just wondering if possible to replace the rim of the phone? Is this metal or just plastic? Would appreciate if someone could let me know if this is possible. Thanks. Sent from my GT-I9100 using xda app-developers app (HowTos)