Amzer Silicone-Perforated PolyCarbonate Hybrid Case for iPhone 4 - 1 Pack - Frustration-Free Packaging - Black/Hot Pink The smooth outer back shell provides sure grip to keep your device from dropped or bumped. Precise cutouts give easy access to all the functionalities. Plug your charger, cable or headset without removing the case. Easy installation, just snap on your iPhone 4 without any tools, also very easy to take off, no tools needed. This case is made up of a hybrid of the contemporary Silicone skin case and the classic Polycarbonate hard case.