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i tried a similar shell for iphone 4, as slim as this one, it really sucks

doesn't keep its form and it is made to protect from scratch rather than from shocks

avoid this for a bit thicker shell
 
Since I am looking for scratch protection for the back, the things that catch my eyes the light weight and the slim design (even thinner than the Smart Feather case but without the hinge that stops removing the Smart Cover).
 
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