Thank you for viewing. This is a Breslmair mouthpiece for large-bore tenor trombone, the Dietmar Küblbeck model. ・DK Y2-6 Model of Dietmar Küblbeck, principal player of the Vienna Philharmonic Orchestra ◽️Specifications Inner rim diameter: 25.888mm Outer rim diameter: 39.300mm The rim width is narrow and slightly flat, deep Throat size: 7.00mm Silver-plated finish I personally imported it by contacting Breslmair in Austria. The size is about 4G-5G. It has a normal weight and feels light, but it takes in a lot of air and sounds great. The operability is also very good, and it sounds evenly across the entire range, but the sweet spot in the high range is clear and has a brilliant sound. I would highly recommend it to those who like a European-style tone. (I liked it and imported a heavy weight model as well) It has been used a few times and is basically clean, but Due to being a used item, there are some scratches on the shank and wiping marks. Please refrain from purchasing if you are concerned about these details.