Professional Series. With its superb playability, the YCL-631 II sets new standards in Eb alto clarinet design.Yamaha Professional model clarinets boast an enormous amount of meticulous hand-craftsmanship resulting in a very well-balanced, responsive instrument. The tone holes are undercut by hand for precise intonation and the keys are hand-adjusted for a perfect touch.With its superb playability, the YCL-631II sets new standards in Eb alto clarinet design. The tone is warm and full with powerful projection. And the intonation is balanced and true. * Eb Alto Clarinet * Grenadilla body * 19 keys, 7 covered finger holes * Keys and bell: Silver-plated * Ligature and mouthpiece cap: Silver-plated * Mouthpiece: 4C