Alexander Horn Mouthpiece #8 This is a standard model recommended for beginners. I used it a few times, but I didn't have many opportunities to use it, so I kept it in its case. There are small scratches and wear on the insertion point, but there are no major dents or shank distortions. Please check the photos for details. Please be aware that this is not new. Rim Inner Diameter: 17.5mm Cup Depth: 28.0mm Bore Diameter: 3.7mm