(Kit #4) These Tein EDFC Motors attach to the adjustment knobs on your compatible Tein coilovers and allow you to adjust the damping rate from inside of your vehicle. This is especially useful for those who require different rates for a variety of driving. For example, the softest possible setting for your neighborhood streets that are poorly maintained. Maybe a slightly stiffer setting for the freeway which is mostly smooth. Then, if you track the vehicle have a full race setting that you wouldnt dare use on the street.FeaturesSealed rubber motor cover for improved protection Decreased stepping motor size for use on more applications Complete harness with female/ male connectors Extended wiring harness for ease of installation Includes:4x Stepping Motors