The Progressive 444 Series Rear Shock is the ideal solution for those who are looking for a shock that provides a smooth and comfortable ride. This shock makes road bumps and turbulence almost nonexistent with the advanced Frequency Sensing Technology (FST). The FST senses the frequency of bumps and automatically adjusts damping to provide superior ride quality. Its innovative design means you no longer need to load up on special tools, the spring preload can be adjusted by hand which makes this shock a breeze to use. Whether you're commuting, cruising, or enjoying an offroad adventure, trust the Progressive 444 Series Rear Shock to deliver unparalleled performance. When your journey needs great suspension, don't settle for the second best: choose the Progressive 444 Series Rear Shock!