THE "S90" SERIES- Square chamber Through its flexible playing and its balanced tone, the S90 meets the needs of both the student as well as the professional. A stable and reliable mouthpiece that is consistent over all registers.
From the manufacturer-
The S90 can be considered the universal mouthpiece. Producing a very direct, homogeneous sound with great flexibility and suppleness, this balanced mouthpiece will meet the needs of both students and professionals alike. An efficient and responsive mouthpiece, it produces excellent high notes.
Being stable and reliable, the S90 is naturally appropriate for all types of music: classical, contemporary, jazz, pop and so on.