BACH-Bass-Trombone Mouthpiece No. 4GB

BACH-Bass-Trombone Mouthpiece No. 4GB, depth of cup: deep, cup diameter Ø 26.00 mm, rim shape: medium thin, very well rounded, throat: .276 inch, backbore: 429 same cup, throat and backbore as the No. 4G with a more rounded rim. These mouthpieces were developed by Vincent Bach during the past 50 years in order to match all imaginable requirements. The mouthpieces are characterized by volume and mood, easy response, consistent sound and a precisely calculated resistance in order to increase the endurance of the blower. Therefore, they are bought around the world and used almost exclusively by the best musicians.