CL4 mouthpiece for Bb clarinet from Masters series that is characterized by a very radiant clear sound with exceptional intonation, allowing for precise, easy blowing and flawless articulation. It features a specific bore, a new chamber as well as a new exterior design. It has long facing and tip opening of 110 (1/100mm), and it comes supplied with pewter M/O ligature and cap. It works best with Vandoren #3 to #4 reeds.