Romera Brass Horn Mouthpiece, Model "Zen × Ben" Supervised by Tsutomu Maruyama Solo/Chamber 25-eu I am selling this to organize my mouthpieces. 【Solo/Chamber 25 eu】Inner Diameter 17.25mm / Throat Diameter 4.0mm / European Shank According to the product description: 《Solo/Chamber Model》 A light model that offers the best response. It works exceptionally well with single horns and descant models, and matching them with consideration for balance will lead to even more effective playing. This model excels in smooth phrasing and dynamic changes, and the response and control of high notes are also attractive features of this mouthpiece. That's what it says. Although it's a light model, it has a considerable weight, and I personally didn't find that the sound was lost even when using it in a wind orchestra of 50-60 members. The cup is shallow, and as the description says, it was easy to produce high notes. However, the rim is quite thick, so it may be a matter of preference. It feels like the rim of a Bach 10, for example (in my personal opinion). There are minor scratches and insertion marks on the shank due to use and storage, but there are no dents or peeling of the plating. However, please refrain from purchasing if you are concerned, as this is a used item.