I ordered this mouthpiece along with Thomann TTS-150 tenor sax, since reviews for the TTS-150 showed that the moutpiece that TTS-150 comes with, is very poor quality. I must say it's true. Although I'm completely beginner in saxes, I can hear and feel difference between original mouthpiece that came with my TTS-150 and Yamaha 4C mouthpiece. Yamaha 4C is much easier to blow, and much richer sound is being produced.