My go-to mouthpiece for orchestral bass trombone gigs. Allows you to open up without getting too edgy, and also allows you to play very soft with a good core to the sound, unlike larger mouthpieces which tend to sound more diffuse. If you're still in doubt, check out this recording of Bob Hughes and the Royal Scottish National Orchestra! https://www.youtube.com/watch?v=P9Gjk60cwIg