3 Medium cup depth 17.60 mm cup diameter Narrow rim shape. A large mouthpiece for great volume of tone, especially in the low register. 7 Medium cup depth 17.25 mm cup diameter Narrow rim shape. Fairly large size, for a strong embouchure. 7S Medium cup depth 17.25 mm cup diameter Narrow rim shape. Same as No. 7 but with larger throat and backbore. Freer blowing, darker sound. 10 Deep cup depth 16.80 mm cup diameter Medium wide rim shape. This cushion-rim model produces the German romantic horn t