A large bass trombone mouthpiece, larger than a Bach 1G but smaller than a Schilke 59. • 28.40mm cup diameter. • 8.0mm (0.315") 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