From the Manufacturer

The B5 Graftonite Soprano Saxophone mouthpiece features the medium B chamber for the most brilliance and projection, a .060" tip opening, and a 18mm 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.
Since the acquisition of Rico by D'Addario & Co., Rico has strengthened its position as the global leader in woodwind reeds and accessories. Rico's state-of-the-art reed research center in Southern California employs a collaboration of agronomists, scientists, and musicians to produce top-quality reeds, including Rico Reserve premium reeds for clarinet and saxophone. Rico reeds are designed to benefit all levels of musicians, from the beginner to the seasoned professional. Many of the world's finest woodwind players perform with Rico reeds, such as Mark Nuccio, Jerry Bergonzi, Chris Potter, Benny Golson, Ernie Watts, Bob Sheppard, Henri Bok, Richie Hawley, Eric Alexander, and many more.
B5 model for Soprano saxophone
Tip opening: .060"
Facing length: 18mm
Durable; will not chip or crack
Available in three tip openings and one chamber