The TEIN H.Tech springs for your WRX or STi utilizes the latest spring and material technology to optimize comfort, performance, and quality. Designed and tested to be used in conjunction with OEM or similar shocks for excellent ride comfort and slightly increased handling. The Tein H.Tech springs are produced with Vanadium, which is durable, lightweight, and has properties to retain more spring stroke. Tein H.Tech springs are designed for those seeking a slightly lowered stance while maintaining high ride quality at a reasonable price. The Tein H.Tech springs give a average 1.2 inch drop for a more attractive appearance, added performance, and excellent comfort. Includes a one year limited warranty.