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. Are you used to playing a 4 on your large bore and want to maintain that size on your small bore? Now it is possible. The Griego 4 is also a good choice for advanced players that need more room for their larger chops, players using medium bore .525 or .525/.547 trombones, or euphonium players using small shank instruments. - the manufacturer
Specs: • Cup Diameter: 25.90mm • Throat: 0.280 inches