EMPIRE Apple iPhone 4 / 4S 2 Pack of Tribal Design Silicone Skin Case Covers (Neon Green, Red) Compatible with: Apple iPhone 4 / 4S Form fitting silicone material ensures perfect fit without adding any bulk. Engineered to fit device perfectly, with cut outs to allow for full device functionality. Provides added grip which ensures extra protection. EMPIRE is a registered trademark with the USPTO.