D'Addario Reserve Bb Clarinet Mouthpiece, X10E Precision milling delivers unparalleled consistency, eliminating the need to try many before purchase Crafted from a unique proprietary hard rubber for tonal beauty and evenness Designed by a team of top players, craftsmen, and engineers Available in four different facings and two different pitch systems, offering an array of resistance options for clarinetists of all ages, abilities, and geographic locations Made in USA by D'Addario