Made from high quality silicon-chrome steel. Designed and tested for an exact fit and consistent performance. Every spring is performance-tested and measured at the factory before dispatch.Most springs are TUV approved for extra peace of mind. PRO SPORT LOWERING SPRINGS TO FIT. Use manufacturers settings when checking and adjusting alignment. If unsure of fitment Please Send Message with either UK Registration or FULL VIN Number. Mistakes happen from time to time BUT any costs incurred relating to wrongly ordered items will be customers' responsibility. You may get differences in ride height to that quoted due to many factors for example : Car already has after-market springs fitted, or has factory fitted sports suspension. Different equipment levels between models or Springs have sagged due to wear and tear. We supply mainly non-standard items that are often not a straight forward DIY fit. In some cases, modifications or adaptations may be required to achieve an acceptable fit. We therefore recommend that parts we supply should be fitted by a qualified mechanic. Drop links / Stabiliser bars.