OtterBox Defender Case for BlackBerry Curve 3G 9300 (Black) Layer 1: Thermal formed protective clear membrane. Protects keypad against scratching, as well as dust intrusion. Layer 2: Hi-impact polycarbonate shell for an added guard against drops and shocks. Layer 3: High quality silicone skin to absorb bump and shock. Full access to all keys, ports and functions.