ChromaCast Michael Angelo Batio Signature String Dampener (CC-ST-Damp-MAB) Invented and designed by Michael Angelo Batio The mab string dampener is great for tapping and Legato style Guitar playing! fits all 6, 7 or 12 string, Electric or acoustic guitars Easy to use. No assembly required. No drilling anywhere on your instrument! Easily adjustable so you can move it out of your way when you are not using it Durable aluminum construction wont get beaten up during transport or playing