GR 64.7FL This is a used item, but it has no major scratches or dents and does not affect performance. This mouthpiece is no longer in production and is highly valuable. Immediate purchase is welcome. As this is a used item, returns and refunds are not accepted. Please understand this before purchasing. With a Yamaha shank, it fits about 90%, and with a slightly narrower shank like an old Kanon, it fits about 60%. The shank end is 9.1mm, the shank base is 10.8mm, and the length is about 38.00mm. The inner diameter is slightly smaller than a Bach 5C. The rim is semi-flat and slightly thick. The rim shape slopes gently towards the outer edge of the rim. The outer diameter of the rim feels slightly smaller than a Bach 3. The inner edge of the rim is somewhat distinct. The cup is a V-cup and deep. The throat is about #17 (4.39mm). It produces a mellow and warm, orthodox sound. The design is very efficient, preventing the escape of vibrations. #Trumpet #Flugelhorn #Flugel #Mouthpiece #WindInstrument #GR