iSkin has introduced its new Enigma premium case for the iPhone 3G and iPhone 3GS. The Enigma is based around a lightweight polycarbonate case, which is wrapped in genuine Napa leather that’s been treated for added durability. Other features include microfiber inner lining, a non-scratch metallic front face, a push-through Home button cover, metallic accents, open access to all other ports, controls, and the camera, and a slip-in design. Available in black or white, iSkin’s Enigma case for the iPhone 3G and iPhone 3GS will begin shipping on June 8 for $100.