Straight sidewalls, large round chamber, rollover baffle. Tip opening measures 0.77″. This is a nice all-around mouthpiece for classical, section blending, or the developing player. It has medium resistance and a medium-dark tone, but allows for some tonal flexibility. As you would expect from the bore shape, it has more in common tonally with a Link Tone Edge or a vintage Selmer Soloist than with an S80 C*, but still more well mannered, with a bit more resistance and less brightness.