Willie's TL BP1 Gold-plated Trombone/Euphonium Mouthpiece - Model: TL BP1 - Type: Bass Trombone Mouthpiece - Material: Gold-plated finish Thank you for viewing. Purchased in November 2023. There are shank scratches from use. As you can see in the second image, there is a diagonal scratch below the engraving. It does not affect the performance, but please refrain from purchasing if you are concerned. Rim Inner Diameter: 27.45mm Throat Diameter: 8.00mm Features: Combination of 1-1/2G rim and 1G cup This model was supervised by Mr. Thomas Leyendecker of the Berlin Philharmonic. It is characterized by its rich sound despite its moderate size. It has a heavy weight, but I think it is easy to handle.