Inner ring diameter 25.1mm, outer ring diameter 35mm, socket diameter 13mm Wide range of uses: 12C euphonium mouthpiece is suitable for euphonium baritone horns. Bright Tone: Cup diameter adds shine to tone and improves upper register response. Durable: High quality brass material, acid resistant, alkali resistant, long service life. Silver-plated surface: The surface is silver-plated, not affected by allergies, and the arc is burr-free and safe to penetrate. Linear design, easy to hold
