The B5 Graftonite Bb Clarinet mouthpiece features the medium B chamber for the most brilliance and projection, a .050" tip opening, and a 19mm facing length. Each Graftonite mouthpiece is made from durable polycarbonate material and is pitched at A=440.Designed by the world's leading mouthpiece designer, Arnold Brilhart, the Graftonite line of mouthpieces incorporates revolutionary materials to achieve ease of tone production and a wide range of tonal colors.Designed in the 1980's by the world's leading mouthpiece designer Arnold Brilhart, the Graftonite line of mouthpieces incorporates revolutionary materials to achieve ease of tone production with a wide range of tonal colors.