The Tanabe Sustec Pro S-0C is a street coilover suspension kit that is engineered to deliver a comfortable ride. A helper spring is included to allow for greater flexibility in ride height. This also prevents pre-load on the main spring when the height is raised, ensuring a comfortable ride. Included are the 210 series springs, that have superior strength and durability through state-of-the-art manufacturing process delivering a tensile strength of 2100N/mm. Sold in a complete set of 4.