Coil spring with a 300 lb spring rate. Tapered pigtail end. Made with chrome silicon and has a silver powder coated finish. 3.57" inner diameter and a 11" length. These silver powder coated springs fit perfectly with QA1's Pro Coil Shock Systems. These springs are available with flat and pigtail ends and in 10" and 11" free lengths. Made with the highest quality materials, QA1 springs are strong, consistent and have a long life. All QA1 springs are manufactured using the highest quality materials for high strength, consistency and long life. They are cold wound, heat treated and shot peened to ensure consistency, accuracy and durability. All QA1 springs are ground at both ends to ensure straight, consistent and accurate operation. They are either silver powder coated for excellent longevity, or are polished and chrome plated for the ultimate in appearance. Lengths and rates are clearly marked for quick and easy identification. All QA1 springs are lifetime guaranteed to remain within 2% of the original free height and rate under normal operating conditions.