RadTech Portectorz 3.5mm + 30pin port combo for iPhone 3GS,3G in Black Premium grade high-polymer Silicone and organic polyurethane is smooth and tack-free Precision uni-die molded for a perfect fit with no unsightly mold lines Keeps delicate ports clean, dry and positively protected from damage Low-profile design blends perfectly with your device's style MagSafe sealing insert assures positive protection for magnetically-secured power ports