sshhmute Practice Mute for Tenor Trombone; made from lightweight ABS plastic with cork seal; gives accurate tuning throughout the range; helps to develop and open the throat muscles to give better air flow; has minimal back pressure, enhancing pitching and accuracy; lightweight 180g; dimensions: 139 mm x 47 mm x 198 mm (Base width x Neck width (incl. seal) x Height); colour: black/blue