Hirschman Mutes "KR Indigo Big Blue" Trombone Plunger Mute

The Hirschman Mutes "BIG BLUE Indigo" Plunger Mute is the best sounding, most in tune, easiest to play, most comfortable to hold, most expressive trombone plunger that money can buy.  It is designed to work with tenor trombone AND bass trombone.