Bilstein B12 (Pro - Kit) suspension kits include a complete set of Bilstein Performance dampers paired with Eibach (Pro - Kit) springs that provide moderate lowering between 24 - 40mm (depending on application). These kits offer dampers and springs that are tuned for each specific application to provide the best fixed height lowering solution. Bilstein B12 (Pro - Kit) suspension kits provide the perfect combination of suspension dynamics, quality and aesthetics.