Crafted for the discerning bass trombonist, the Yamaha Signature Bass Trombone Mouthpiece, featuring the esteemed Doug Yeo 24K gold rim, is a culmination of precision and quality. This elite mouthpiece is designed with a semi-wide backbore and a large shank to provide an expansive sound and improved playability. The gold-plated finish not only adds a touch of luxury but also ensures durability. Its semi-flat, semi-thin rim contour and 28.72 mm. inner rim diameter are engineered for a comfortable fit, while the semi-deep cup depth is ideal for rich tones. Made in the United States, this mouthpiece is a choice that resonates with both professionals and advanced players.