The Koni Special Active Shock Absorbers control suspension movement through automatic hydraulic damping that adapts to changing road conditions during everyday driving. Frequency Selective Damping technology inside the responds to the frequency of suspension movement to manage body motion while maintaining tyre contact with the road surface.The following features outline the technology and engineering used in these shock absorbers:Frequency Selective Damping (FSD) Valve Technology: An internal hydraulic valve system reacts to the frequency of suspension movement so lower-frequency inputs created by braking, steering and acceleration generate firmer damping while higher-frequency inputs from uneven road surfaces pass through the with reduced resistance, which helps maintain controlled body movement and stable tyre contact during normal driving.Passive Mechanical Damping Adjustment: The changes its damping behaviour automatically through internal hydraulic valving without sensors, wiring