Sebastian Knox T.Sax Mouthpiece AMERICAN Series "Traditional" 102 The tip opening is 102, which is about the same as an Otto Link 6⭐︎ to 7. This is highly recommended for those looking for a high-quality Otto Link rubber mouthpiece. Many professionals have played it, and it has been very well-received by all. Currently, it is only available at one store in the Kanto region, making it a rare mouthpiece. I am selling it because I have been playing the tenor saxophone less frequently. Thank you very much.