The material is made of "SWO" material that has been proven in the R-tune series and is easy to induce initial sinking even with a high spring rate, giving it a strong kick-release feel and control performance in a higher dimension. Spring length is R? ve D has a total length of 0.9 inches (23 mm), and is extremely short for maximum performance in real stroke. By shortening the springs, it reduces leg stretch and stabilizes the front and back of the tire for a stable surface pressure. It can be used both front and rear of the front and rear and continues to adopt a line tight construction that is popular in the R-tune spring series. By switching the spring up and down, you can instantly adjust it to suit your road conditions and driving skills. The lineup comes in 3 types (soft, medium hard, hard). All 3 types are also available in a dedicated box. Please try the R-tune Spring for RDX to match your vehicle weight and road grip.