This is a DONAT mouthpiece, not widely available in Japan, and was introduced at a certain shop as an item released by Eric. The user purchased it because they liked the feel. There are no performance-impairing scratches, dents, or repair marks. Note that the size feeling is quite different from the mouthpiece Eric uses. The 171 is about the size of a Bach 1 1/4, which seems quite large at first glance, but because of the flat rim, even I, who usually play a 3C, can play it. It's the shallowest model, perhaps similar to a Bob Reeves D. The sound when played softly is truly wonderful, and I think I can play it without switching mouthpieces, such as during solos. It's like a Monette Prana, and subtones are incredibly easy to produce. (Like the Monette Prana, it is said to have undergone full annealing.) Of course, the high range is also easy to produce. However, be careful not to overblow. It's not a mouthpiece that will help you when you get tired, like a Bob Reeves. The new price is 149 euros (about 27,000 yen) plus shipping. After playing, I always washed it with water and swabbed it. Highly recommended.