Gadget Guard The Rail Case for iPhone 4/4S - 1 Pack- Retail Packaging - Silver Exoskeleton Design, Wraps and Protects All Surfaces Hard anodized 6061 Aircraft Grade Aluminum No Signal Interference The Rail from Gadget Guard ; Proving beyond a shadow of a doubt that Safe Can Still Be Sexy . The Rail includes: one case, four additional interchangeable attachment pins for extra customization, and a pin cartridge for storage.