The Pierobon Flugel S has the same rim as the Pierobon Classic. The ID is .661 with an OD of 1.12. The rim is a very comfortable Gabriel style with a lateral dip of 15/1000". The cup is medium shallow for a flugel mouthpiece with a DOC design and the throat is .169".
One piece flugelhorn mouthpieces are available with a Standard (American, Yamaha) or Bach shank.