The Bowjax Ultrajax String Silencer has been Bowjax" s most popular model with bow companies and consumers for the past two years. It"s been a top seller because of its effectiveness and ease of use. Simply put the Ultrajax on the string and use the supplied plastic ties or your own string material to cinch string silencer to the string, to effectively dampen the oscillation that occurs after the shot. For compound bow users that are looking for even more dampening ability, attach an Ultrajax to your cable.