Here we have a back cover & 'bumper' (this constitutes a strip around the edge of the phone, not an enveloping rubber surround - see photo) for the iPhone 4 in Black 3M DI-NOC 'real' carbon fibre VINYL- the most authentic (and expensive) on the market and much thicker than printed carbon vinyl - the very best! Please use Google to look it up as some people think they are getting real carbon fibre.
3M DI-NOC Carbon Fibre is a flexible PVC film with a black woven carbon fibre pattern with a ridged feel to it. Designed with special adhesive and air release channels for faster bubble-free application, the carbon vinyl has excellent adhesion and flexibility, allowing it to be used with ease on many surfaces by complete novices.
Covers the back and sides of the phone thus minimising scratching and generally protecting the case. The Apple logo cut into rear vinyl reveals the silver design underneath so you don't loose that important logo! In fact, due to the glass back and the thickness of the vinyl, the Apple logo gives a 3D effect when looked at from the side. Also included is the 'bumper' for the area around the edge of the iPhone. Admittedly, it is fiddly to put on but the result not only looks good but on my phone eradicates the problem of signal loss that everyone is talking about.
Also, importantly, the phone will still fit in the Apple cradle for the PC and all other cradles whether they be in the car or otherwise. A lot of protective covers annoyingly don't do this. There are holes for the camera and flash and all the buttons / holes etc on the side of the casing - be careful not to touch the sticky backing if possible and especially the adhesive on these small areas.
The vinyl rear cover just needs to be removed from the backing and carefully aligned over the Apple logo and camera & flash holes. Press down, working from the middle outwards to make a perfect fit. With the bumper, start from the bottom of the phone (where you dock it) and go around the phone towards the Sim holder first - this is appararant when you see the appertures cut out.
It does cover 100% of the back area and gives excellent protection and lasts over 10 times longer than the thinner covers - in fact the life of the phone I suspect. The pictures show the cover applied to my own iPhone 4.