... , alloy steel, iron plated Black color bending spring1.bending spring with wire diameter 2.made of carbon steel, piano steel ... steel, piano steel, alloy steel, iron plated steel.3. bending spring is extensively used in telecommunication, computer peripherals, housing appliance, switching ... provided.1,Tracking service2,Payment have L/C,T/T,D/P3,Free sample4,Delivery have 20days5,Load type is extension ...