This RIGID LED Light Bar Resonance Damper is designed specifically to fit seamlessly in - between the heat sink fins of your LED light bar. This Resonance Damper will reduce the amplitude of mechanical vibrations and whistling noise when travelling at high speeds. Use for any E - Series, RDS - Series or Radiance light bars. This 3 - piece set easlily slides onto any location on your RIGID Industries LED light bar to absorb harmonic distortion from the fluting of extruded heat sink fins.