"The MAB String Dampener" fits ALL 6, 7 or 12 string, Electric or Acoustic Guitars. The function of "The MAB String Dampener" is to stop ALL extraneous or unwanted string noise. This results in ONLY the note you want to sound is played. All other notes are completely dampened. "The MAB String Dampener" also helps stop excessive feedback, helps "cleanup" your guitar playing, is completely adjustable and moves out of the way when you don't want to use it. If you are playing a passage on your guitar that requires "The MAB String Dampener" you can with one quick motion put it down on the frets and use it. When you are done using it just move the bar up and out of the way. This dampener is so easy to use, install and adjust that we feel comfortable saying it is THE BEST one in the WORLD! "The MAB String Dampener" is 100% made in the USA out of the highest quality materials, anodized jet black with silver screws and features a white dampening agent to completely block unwanted string noise. Not only does it work fantastically, it looks great.