Designed specifically for compound bows. Constructed of aircraft aluminum and weighs less than the top selling carbon bar sight. A superior "Windage Dovetail Guide System" replaces inferior twin-dowel guide systems. Features the "VTS" (Variable Tension System) providing an adjustment where the archer personally chooses a desired elevation travel tension setting. Provides 2.875" of elevation adjustment. 6" or 9" extension features the Mathews Harmonic Damper.