Yamaha Silent Brass SB1J Tuba MuteThis new generation of mute allows you to play with a mute without having the back pressure of a regular mute. It offers a natural sound, compact and light design, reverb options, USB connection and works with batteries. It also works with Rec'n'Share app. Adjustable Pitch and Playing Feel An adjustable rod allows the position of the mute head to be raised or lowered inside the bell while playing. This gives you the ability to customize the feel and