ONGUARD LLC ONG-IP4S-9 EDGE X-Series Bumper for Apple iPhone 4S - 1 Pack - Retail Packaging - Black/White/Yellow The inside of the Edge X Case is lined with a protective close-fit, high tech shock absorbingmaterial that reduces the G-forces of impactand shaking to protect thedevice effectively. K2W Edge X series iPhone4 Protective Bumper is created out of same high grade aluminum used in aerospace design making it ultra light, super strong and gorgeous! Edge X-seriesoffers beauty, function, uniqueness, superb workmanship, minimal bulk, market longevity and a lower price than competitor's similar products