A large bass trombone mouthpiece. • 28.91mm cup diameter. • 8.08mm (0.318") throat bore. • Silver 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