Alliance Cornet Mouthpiece PC3 This is a model designed by Philip Cobb, and is currently not widely available. The cup depth is shallow for a British model. 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.