Greenhoe New York Style (Back Type) yellow brass mouthpiece pipe. For bass trombone (GB5). This is the shorter (#2) of the two types of mouthpiece pipes. Type: GB5 (Bass Trombone) Mouthpiece Pipe #2 Material: Yellow Brass Length: 165.1mm Throat Diameter: 12.8mm This is a used item, so there is some wear and tear. (Used for about a year) Please be aware of this.