Wrap-Up Next Compression Spring Set 45mmWrap Up Next (#0038 25) Compression Spring Set 45mm Feature: For: Universal Parts 45mm long specification "compression spring" developed for rolling. The vehicle height is secured by the repulsive force generated by shortening and setting the long spring. It is now possible to use a spring with a softer rate than ever before. It solves the problem that the conventional spring is too hard to roll and the soft spring cannot secure the vehicle height.