... the back side,very smooth,feels very good.Strong case, Long Using life about 2 years or more and ... not easy leave scratch on the back of the case, we could inject the high quality rubble oil around ... to use,easy install and remove.Openings for the docking port ,headphone, power button, volume buttons which allow all access ... quality,best service,competitive price Best Seller Silicone case for iphone 4g