... steel, piano steel, alloy steel, iron plated Black color bending spring1.bending spring with wire diameter 2.made of carbon steel, piano ... ,VDE,GS,CE,our factory follows "honest style,high-quality,reasonable price and punctual delivery date to be our aim ... housing appliance, switching and other industrial areas.4. high quality and many good choice.5. plastic bags/inner carton./outer carton packing6 ...