Wallace TWC-312 straight mute for tenor trombone, made of aluminium with copper bottom, identical to the TWC-311, but with a more complex sound, unlike any other straight mute, our concept for this mute was determined by the desire to make one mute that would play all notes, high or low, loud or quiet, all the way down to pedals and as high as you can play at all dynamics, there is a 10 mm lip which makes this mute easy to handle and secure for quick changes