We've seen a handful of metal cases for iPhones in the past; they're rather uncommon these days due to pricing and their tendency to affect signal strength. Regardless, Rokform has introduced its own take on the style called Rokbed for iPhone 4 ($79-$99), machined out of aluminum to form a frame with an X shape on the back. Two screws hold the squared-off bottom portion in place. When it is removed, the iPhone 4 can slide in and out. Long openings…
