combination thereof any of the metals which may be used for the metallic layer s as described later may also be used for the metallic fibers some or all of the metal filler may be of a metal or a metal alloy that is generally corrosion resistant e g stainless steel or some or all of the metal fiber may be of a metal or metal alloy e g aluminum magnesium or both that offers cathodic protection to the metal layers and or to other metal fillers the filler e g metallic filler preferably includes consists essentially of or consists entirely of fibers the concentration of the fibers e g metallic fibers is preferably greater than about 1 volume more preferably greater than about 3 volume even more preferably greater than about 5 volume even more preferably greater than about 7 volume even more preferably greater than about 10 volume and most preferably greater than about 12 volume based on the total volume of the filled polymeric material the metallic fibers may be present in the filled polymeric material at a concentration less than about 50 volume preferably less than about 40 more preferably less than about 35 volume still more preferably less than about 33 volume and most preferably less than about 30 volume e g less than about 25 volume or even less than about 23.