Willie's Michael Masson signature model. This high-performance model is suitable for a wide range of applications, from orchestra to solo work. [Product Information] ◆ Trombone Mouthpiece for Large Shank Manufacturer: willie's Model Number: MASSONG 5TM / Gold Plated (Rim Inner Diameter/approx. 25.50mm, Throat Diameter/7.16mm, Weight/182.9g) [Condition] This is the Michael Masson signature model. There are shank scratches, but there are no noticeable dents or scratches other than on the shank, and it is in good condition. I think this is a very easy-to-handle model with a medium-heavy weight and a rim size of 25.5mm. The silver base is slightly visible on the shank, but the gold plating remains beautiful overall. Please check the photos for details.