Like many other companies, Essential TPE has developed an iPhone 4 hard plastic shell; this one's called Iro Case ($25) and comes in six different colors, including the clear, baby blue, black, and tan versions here. The only major differences between Iro and many rivals we've seen is TPE's use of thicker, curved plastic to improve the iPhone 4's feel in your hand -- something that makes the device more like an iPhone 3GS -- and its inclusion of both…
