On the world's fastest racetracks, on the street, on the toughest outback terrain there is. When it comes to spring design and durability, King Springs knows neither compromise nor second best. ...these are the cornerstones of our technology, and the reasons why King Springs are leaders in the replacement and performance automotive spring market. This new generation steel allows King Springs to further improve many of their existing designs by reducing the amount of steel required in a spring, making it substantially lighter (by approximately 30%) and reducing the solid height therefore increasing travel. Being of particular benefit at all top levels of Motorsport, this new high stress material was introduced to the leading v8 super car teams (inc HRT, FPR & HSV) in early 2007 giving a hugely successful endorsement of its characteristics & proven durability. Although considerably expensive king springs are progressively introducing this new high stress steel to their passenger car and 4wd designs which benefit the most at no extra cost to the consumer. The pro sport range is now entirely manufactured in this new grade of steel. See the 2009 Catalogue (find your car and spring type) .PDF Email us for the latest best price: Inquire for your car now