I received a black iPhone 4 bumper with my purchase of the phone and didn't expect great things, but it has exceeded my expectations. The case fits snugly around the outer edge of the iPhone 4 only, with holes for the charger and 'silent mode' switch. There are silver buttons over the 'sleep/wake' button and +/- volume buttons on the side of the phone. Therefore, all functions are still easily accessed. Since the case obviously doesn't cover the front and back of the phone, you should probably consider using scratch resistant plastic covers/skins on the iphone body to ensure scratches don't ruin your new phone! The bumper seemed to stay in place throughout its use. One minor issue was that if I used one of Apple's old style charger connection leads (mine was from my iPod Nano first generation) instead of the charger connection lead meant for the iPhone 4, it wouldn't fit into the hole unless the bumper was removed. However, it is fine with the correct lead. If you decide to purchase, be aware that my bumper's silver casing that overlay volume and sleep buttons fell off, making access more difficult and the edge started to show wear and tear after about 4 months. I have dropped my phone on concrete before and the bumper spread the shock very effectively - no cracks or scratches on my phone surface - just on the bumper!