Apollo 595V Trombone Mouthpiece Inner Rim Diameter: 25.95mm Throat Diameter: 7.1mm Cup: Deep In relatively good condition. I haven't used it much as I bought it as a spare. The following is a product description: The sound of the trombone in orchestras has various characteristics depending on the country. Germany has a clear and resonant sound, France has a dazzling and brilliant sound, and America has a bold and powerful big sound. The APOLLO series was designed for this modern American symphonic sound. Mr. Hiroki Sato, principal trombone player of the Tokyo City Philharmonic Orchestra, supervised the design and made detailed adjustments from scratch. It incorporates numerous new features, such as the J-rim, which is designed with the Japanese dental structure in mind, the APOLLO Throat, which improves the tone of the low register, and a body with Resonator processing for a rich sound. Even the thickness of the shank was tested by actually shaving and testing several prototypes. That's all. Thank you for viewing.