DEG Comparison Chart:

3C - Medium cup depth, 16.30 Approx. cup diameter, Medium Wide rim shape
Compare to Bach 3C Cornet Mouthpiece

7C - Medium cup depth, 16.20 Approx. cup daimeter, Medium Wide rim shape
Copmare to Bach 7C Trumpet Mouthpiece

10.5C - Medium cup depth, 15.90 Approx. cup diameter, Medium Wide rim shape
Compare to Bach 10.5D Cornet Mouthpiece