About Product:Spring wire, also known as slingshot line and helix, Is a device connector that works with scalability. The power connection, informs The to control The movement of mobile devices can bounce back quickly in a short time. It is widely, informs in mobile devices to As automobiles, machines and meters. According to the direction, the main direction of the left and right spiral spring. According to the material: Main TPU spring line and PVC spring line; TPU spring wire from the flame retardant, oil to hold, acid and alkali to hold, low temperature hold, uv protection, abrasion to hold, hydrolysis to hold the and other special effects. PU material as the preferred material for spring wire is more and more widely used.