Hirschman Mutes “Chicago Stinger” Gen II Upgrade Kit (Tone Boosters) Trumpet or Trombone

This kit includes a 3-pack of Tone Boosters designed to enhance the slotting, playability, and intonation of your Gen II Stinger Mute (Trumpet or Trombone models). Simply unscrew the caplets, place a Tone Booster on top of each existing resonator, and screw the caplets back in.