Leather mute weighs ~6.6 grams and will fit on most bridges. It has a slot and notch design that allows two different placements for muting effects. Over the bridge for pianissimo, and pressing below the bridge for mezzo piano. You can also customize the mute by moistening the notches, and as it dries on your strings it conforms to them. When not in use, the two notches in the mute hold it in place on the afterlength.