This is a Yamaha euphonium mouthpiece, large shank, silver-plated. It is a signature model of Shoichiro Hokazono, a world-renowned euphonium player. It has been used for several years, so there are some insertion marks on the shank. However, there are no dents on the rim or shank, so I don't think it will affect the performance. In my experience, it produces a good sound, but I felt like my breath was being used up quickly. It seems the sales period was short, and it has already been discontinued, so it is not often available even used. Please check the photos and description carefully before purchasing as it is a used item.