This is a rare mouthpiece that is no longer sold. While the tip opening is similar to a 5RV, the material gives it a rich, full tone. This product has been refaced by Le Bon Bec, a specialist in clarinet mouthpieces. https://x.com/lebonbec_cl I used it with a Légère reed (soft), and it was easy to play without any stress. I think it's a very good mouthpiece, as it's easy to control the intonation. At that time, the cork was replaced and the metal parts were polished, so it's in good condition. There are no scratches or chips, and I think it's in very good condition. I am selling it to raise funds. If it doesn't sell, I was planning to use it myself, so I will remove the listing after a while. Mouthpieces are quite expensive to buy now, and they do wear out with use. A glass mouthpiece, if you find a good one, can last a lifetime, making it economical.