Tension spring: This spring is used for cars, the spring and the hook on the pic are the parts for the auto wiper. We produce according to customer's drawings or samples. The material of it is steel. We also can make with spring steel. The finishment of it is zinc plated(blue &white, yellow, green.)black, plain, HDG and so on. Packing in bulk or carton. We can make it according to your drawing or sample.