How should I repair the area underneath my front bumper?

Usually underneath the front bumper there is a dark, hard yet flexible piece of plastic like material that helps prevent damage to the underside of the car. Im not sure what this specific piece is called but mine has lost a few screws/bolts due to uneven roads causing it to hang down. What is the name of this part, how hard would it be to fix and how much?|||This panel has several names, some people refer to this as the lower valance panel , radiator deflector panel, and or lower front mud flap. Without seeing the panel and not knowing what you drive, this makes it hard to give a cost. If the panel is not ripped apart, using metric screws or bolts, the panel can be reattached. If the screw/bolt holes have become enlarge, fender washers (or metal or plastic jar cap covers with a hole punched in the center) can be used as a patch over the enlarged hole when reattaching.|||i need to kno about this also..becuz one of the screw(s) came off of my back bumper and it hangz...|||Its called a mud flap|||I've always heard it refered to as a Rock Valence or lower Radiator valence usually to protect the car's mechanicals from any damage while driving. If it is cracked, try using epoxy to reglue it back together. Otherwise, you should try to get the correct size nuts and blots to rehang the valence. I've also see it supported by 2 zip ties, but that was only because 2 of the 6 bolts were missing.