Generic Black Replacement Silicone Skin for Iphone 4, 4S OtterBox Defender * Replacement Silicone Skin compatible and comparable to OtterBox Defender * Rugged protection and a 30 day warranty are included with any purchase with Authorization card from Mobile Supply and it's affiliates * A very cost effective replacement for your current model * Mobile Supply and it's products are protected under US Trademark laws. Warranty card and authentication number send with every purchase. If you did not receive a warranty card please return your item immediately. * 100% silicone skin that is thick and durable. This is NOT an OtterBox Brand skin, nor is this an actual case! This is simply a replacement for your current outer layer