The Pierobon Cornet top is the signature cornet mouthpiece of Marco Pierobon of the Gomalan Brass. The diameter is slightly smaller in diameter than a Bach 5C with a wide Gabriel style rim. The rim has an ID of .662 and an OD of 1.12. The lateral dip is 15/1000". This is the same rim found on the Pierobon C, Lead and Pierobon Flugel. The cup is the depth of a Wick B an throat is #19. This top must be used with a separate Wedge Short Cornet Backbore, which can be purchased separately.