1. OD2-30mm,any length 2. Black flexible metal tube 3. Bend no noise,no rough feel 4. ... Strong holding,no rebound Black flexible metal tube Specifications Brand Shuangcheng GooseneckMaterial Spring wires & galvanized iron wire ... ,LED lamp and lantern, lighting, Microphone, headset, earphone, camera, USB products, medical and detection equipment, car navigation system, E-cigarette ...