French Horn Mouthpiece JK w 2DK A1 Rim Gold Plated European Shank Owned for about a year, with actual use for about six months. It's in good condition and usable, but there are marks from attaching it to an instrument. Rim Inner Diameter: 17.5mm Rim Outer Diameter: 25.5mm Rim Width: 4.0mm Bore: 4.2mm Cup Depth: Standard V Cup