E-plating black gooseneck with USB,Attractive appearance, perfect bending and strong holding ability E-plating black gooseneck with USB Xiongda Metal gooseneck offers a large select of flexible steel tubing,steel flex ... : carbon steel5.Surface: plating zinc, nickel, chrome, bronze, plating black and others 6.Applications: reading lamp, earth lamp, medical equipment, USB lamp, USB, bracket , hose ...