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Easily add a card wallet to the back of your iPhone 4/4S with the Precision Pocket Card Carrier from KILLSPENCER. The Pocket is made by two craftsmen in KILLSPENCER’s LA workshop from premium, locally-sourced rosewood and Alcantara Suede. It adheres to the back of the iPhone with special removable industrial adhesive. The wallet portion is “specifically designed to carry up to 3 cards – 1 license, 1 credit card, and 1 debit card in the most minimal structure we could imagine.” Inside the pocket, a “finely tuned Flat Spring Card Lock mechanism ensures that no cards will fall out.” The Precision Pocket is $89.00. There’s also an optional front Veil to cover the bezel area.