Give it a higher and make it out.The special size S5 wire will fit a real spring socket. Press the socket to lock.The length of wire Must always be in front of the spring Bao. for the best ejection force.This is a very important point to calculate the angle at which the wire is wound from the outer ring. Because if the calculation of the degree is wrong.The degree of winding on both sides must be as close as possible to 100% of the same size. If this point is not equal, it will cause the truck to tilt.for S5 Wire diameter: 4.0Material:steelcolour:BlackPackage Contents:1 x Land surfboard springOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.