This is the JK (Josef Klier) Will Sanders model. It's in relatively good condition with some minor scratches, aside from the marks from the shank insertion. I'm selling it because I bought a new instrument and the shank no longer fits. Here are the catalog specifications: Cup Inner Diameter: 17.5 Throat Diameter: 4.3mm Cup: V-cup Original Price: ¥16,500 (tax included) Please understand that this is a used item and has been inspected by an amateur. Returns are not accepted. Thank you. Horn French Horn Mouthpiece Josef Klier Will Sanders