This is the mod. It comes with a clear back if you want to use it as a case as opposed to a bumper, or you can purchase additional back plate with various designs. I don't have anything on the back as I'm using it as a bumper only.
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the mod can be used as bumper style or case style. if you use it as a bumper style it comes with a rim that reinforces the bumper. its the white trim that you can see on the back of the phone. the rim piece it comes with is the same color as the bumper, but I purchased an additional one in white since I wanted to contrast against the blue bumper. it also comes with a clear back, so you would take out the rim and put the back on and use it like a traditional case. you can also purchase additional backs with various designs. hope this answers your question.
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that looks really good and thin. is it really slippery? I do prefer a metal bumper since it has the advantage of rigidity, but they are usually expensive and when you drop it on a rough surface it usually leave nasty looking scuffs.
I have also preordered the dbrand grip on kickstarter from a link someone posted on here as it looks really nice and looks to provide a much better grip. but it won't be shipping til the end of Jan at the earliest.