QA1's 2.5" I.D. Coil Springs are offered in 6" to 14" free length and available in a chrome plated or silver powder coated finish. QA1's springs are made with the highest quality materials to make them strong, consistent and have a long life. A lifetime guarantee ensures that all QA1 springs will stay within 2% of the original free height and rate under normal operating conditions. Chrome Silicon Steel (CrS), All QA1 springs are manufactured using the highest quality materials for high strength, consistency and long life. Cold Wound - Heat Treated - Shot Peened, All QA1 springs go through intensive manufacturing processes to ensure consistency, accuracy and durability. Squared Ends, All QA1 springs are ground at both ends to ensure straight, consistent and accurate operation. Protective Coated, QA1 springs are either silver powder coated for excellent longevity, or are polished and chrome plated for the ultimate in appearance. Lengths and Rates Marked, All QA1 springs are clearly marked with the free length of the spring and spring rate for quick and easy identification. LIFETIME GUARANTEE, All QA1 springs are lifetime guaranteed to remain within 2% of the original free height and rate under normal operating conditions.