Lenntek's Sonix Inlay and Inlay Print ($35) are the company's first cases for iPhone 5, and they use a combination of plastic and rubber to protect the device. Instead of one integrated piece, the case separates out into a soft core and a rigid shell that fits on top. Thanks to the rubber, each Sonix Inlay design offers button protection, while leaving the bottom open for access to the Lightning and headphone ports, as well as the bottom speaker and…