Beretta Rear bumpers are also called bumper covers. The Chevy Beretta rear bumper is plastic portion that is attached to the exterior back part of the car. There are many aftermarket Beretta rear bumper options for styling up or changing the rear bumpers. They are available in many different quality and designs. They are made of high quality of ABS plastic, fiber glass or even carbon fiber. They reduce the after effects of crashes, but the Beretta carbon fiber rear bumpers are not a very god option for the GTZ, GT or any other trim line.