e13ctron S4 & S4V aluminum cases for  iPhone 4 and 4S are

CNC machined from a block of 6061 T6 aluminum and weighing less than 20 grams the case is fully suspended around the iPhone 4's antenna by the use of plastic injected liners.  The case is a two piece design having a front and back cover held together by six stainless steel screws (includes black and natural stainless screws). The case is available in many colors and color combinations to suit your look, style, and mood.