444 Series Shock - Chrome - Heavy-Duty - 12.5"5128153Caracteristicas: Feature the all new Frequency Sensing Technology (FST) which allows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride quality Deflective disc valving Adjust spring pre load by hand, no special tool needed Include a progressive rate spring and are high pressure gas charged for consistent performance Shocks slightly longer than stock may alter head angle slightly and provide quicker steering.