Bioserie Bioplastic Cover for iPhone 4 - Retail Packaging - 1-Pack - Prism Weighs only 12 grams,1 mm thick, provides scratch and impact protection without bulk. Patent pending feet at the corners keep screen away from flat surfaces during face down placement. Bioplastic alloy developed for iPhone 4 cover is exclusive to bioserie and offers significant performance improvements. Does not spill over iPhone's screen area; allowing easy typing and flicking. Does not attract dust or stick in your pocket like silicon or rubber cases.