Thank you for viewing. Best Brass Trombone Mouthpiece Gold-plated, for large bore trombones. Model number is 6C, with groove processing (screw-shaped) on the throat. Please check the Best Brass website for detailed sizes. There are scratches on the rim, body, and shank. There are no major scratches or dents that would interfere with playing. Please refrain from comments asking for a price reduction. If you are interested in used or new mouthpieces, please search for Net Brass. net-brass.com #Mute #Trombone #SilentBrass