The hlins Road & Track suspension gives our customers a true racing experience, with their own cars, without losing comfort when commuting to work. Our unique Dual Flow Valve (DFV) technology allows you to quickly change the stiffness of the shock absorber. When arriving to the racetrack, just turn the golden knob clockwise on the damper to set it in race mode this action changes all four areas in the damper; low and high speed compression and rebound damping.