Tilz is a leading manufacturer of mouthpieces in Europe. They pursue a balance of sound in all models, including design and materials, and offer over 1500 model sizes. They are highly popular among horn players and also produce many signature models for individual artists. Gold plating finish [S8] Rim inner diameter: 17.5mm Bore diameter: 3.8mm Cup depth: Medium This is a standard Tilz model that can be used for all-around playing. American shank: Compatible with Yamaha, Hans Hoyer, Wenzel Meinl, Holton, Conn, etc.