Standard mouthpiece for tuba and sousaphone Yamaha BB67B4

Standard series that uses common brass for the mouthpiece. Smooth attack, easy control. BB-67B4: Large inner rim diameter and shallow cup for easy pronunciation and bright tone. It is easy to produce high notes and the low range is extremely clear, making it ideal for F tubes. Rim inner diameter (mm): 32.06 Throat diameter (mm): 7.02