The Pierobon C is the signature mouthpiece of Marco Pierobon of the Gomalan Brass. It 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 Lead and Pierobon Flugel. The throat can be #27 or #25. Marco usually plays on a #25 throat and a ML regular weight backbore. This top must be used with a separate Wedge or similar backbore, which can be purchased separately.