The Noise Dampening Package progressively reduces decibel level and shortens noise duration when used on a crossbow. It features a setof Bowjax limb vibration dampeners that fit limbs with gaps of 11/16in -3/4in and 13/16in - 1 3/8in, a retention spring dampener, and barrel dampeners. Compatible with all TenPoint crossbows 2011 & newer, Horton Crossbow Innovations crossbows and Wicked Ridge crossbows 2012 & newer. Not compatible with RDX model