Vandoren Bb-Clarinet BD4 13 Series HD; mouthpiece for Bb clarinet (Boehm system); Black Diamond series: full and sonorous sound with an enormous richness of color especially in the upper register; Tip opening: 1.16 mm; facing length: medium long; material: ebonite with high density, 100% natural origin; 13 Series model: American diapason (concert pitch), 440 Hz; warm and compact sound; special lightness and articulation