Manufacturer Feature
The Schilke line of horn mouthpieces features 9 models including 3 Artist models and the original Farkas model.
In numerical order: the 27 is the Dale Clevenger model with a narrow diameter and thin rim; the 30 is the Farkas model with a wide rounded rim and fairly deep cup; the popular 31B has a wide rim and large bowl cup created for Frank Brouk formerly of the Chicago Symphony; and the 31C2 was developed for David Sprung of the San Francisco Opera, it has a very thin rim and medium-large cup.
Other popular Schilke models include the 29 -- it has a fairly small bore and relatively shallow cup good for high horn playing, as well as the 28, considered a true 'French' model also with a small cup good for descant horn of the highest variety.