B-Stock, Rousseau Classic NC4 mouthpiece for alto saxophone; tip opening: .064"; developed as a complement to the original Rousseau “R” Series, but it quickly took over as the most popular Rousseau model; new rollover baffle to give good projection and a then generous dip in the chamber after the rollover baffle provides a beautiful warmth to the sound; redesigned sidewalls give an even, centered tone; the symmetrical tip rail gives an immediate response at all volumes; a longer shape provides a more secure fit and easier tuning, B-Stock with full warranty, may have slight traces of use