Reserve Evolution Bb Clarinet Mouthpiece, EV10 Precision milling delivers unparalleled consistency, eliminating the need to try many before purchase Revolutionary ramp and bore taper geometry for fuller, more centered tone Altered baffle for added projection and articulation nuance Medium-long facing for greater flexibility Expertly-designed and made in the USA from foreign materials by a team of top musicians and engineers Offered in two different pitch systems--440Hz, and 442Hz