Opening: 100 Medium chamber This mouthpiece goes for over 200 euros! http://www.berglarsen.com/mouthpieces_blackebonite.html
The ESP is a 24kt Gold Plated Metal Saxophone Mouthpiece. The opening is marked 110x which I believe is like 8*. I hardly used this one because it is too bright for me. There is a removable baffle which is a smart feature to get brighter if the situation requires it. Delivered with ligature and cap.
For more info check out http://www.jodyjazz.com/esp.tenor.html
Morgan HR Jazz Model Mouthpiece for Tenor Saxophone Large chamber, opening 8L
This mouthpiece is usually sold for $500 like on this site: https://dropitprice.com/index.php/product/morgan-hr-jazz-model-mouthpiece-for-tenor-saxophone-large-chamber-new/