Opening medium open : 1.10mm- The world s first 100% precision-milled, vintage-inspired mouthpieces- Proprietary rubber is unique to Reserve mouthpieces and is milled, not molded- Precision machining delivers unparalleled accuracy no hand finishing requiredInspired by the most prized, vintage mouthpieces of the 1920s, the Reserve Bb Clarinet Mouthpiece harnesses modern technology, pioneered by D Addario, to recreate the incomparable craftsmanship found in these legendary works of art. Milled not molded from hard rubber for a higher level of consistency, every Reserve mouthpiece is machined to the strictest tolerances. But make no mistake: the true beauty of Reserve lies beyond its polished angles, glorious curves and proprietary materials to something far more remarkable its sound.