Ridenour A Series Clarinet Mouthpiece A Series - MT36 Facing Hard rubber All these combine to make it the preferred model for the orchestra or band clarinetist who must produce large amounts of tonal volume without loss of center or quality in the tone MORE INFO Narrow chamber = more focus The Model RA mouthpiece has a double-concave baffle similar to the RZ, but a narrower chamber width This chamber creates virtually effortless focus and precise definition of the tone, allowing great freedom of embouchure and voicing without loss of tonal quality