Product Name: Custom Stainless Steel Auto Compression Shape: Coil Production Process: Cold Roll Load Type: Torsion Usage: Industrial, Auto, Motorcycle Material: Steel Function: Pressed Trademark: huilida Transport Package: Carton or Bulk Specification: 90508-32354 Origin: China Product Description Torsion spring:This spring is used for motor cars, . 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.