A large bass trombone mouthpiece, similar to a Bach 1G. • 27.99mm cup diameter. • 7.92mm (0.312") throat bore. • Gold plated. The Griego Nouveau series was created to give players the flexibility of a lighter mouthpiece. It provides a width of sound and wider partial feel for a natural playing experience. Every tone and timbre can be manipulated, making the Nouveau a very expressive mouthpiece. - the manufacturer