Alliance Cornet Mouthpiece PC3 This is a Philip Cobb designed model, which is currently not widely available. The cup depth is shallower than British models. Although it's designed for short cornets, the longer design may be related to the fact that he is a trumpet player. Those switching from trumpet to cornet may find it easy to use. As I am a cornet player, I rarely use it, so I am selling it. Condition: Used/Tested No claims, no returns.