BIGBUZZ is a European shank. Used only a few times and has been stored for a long time. I'm selling it because I probably won't use it in the future. There is a small scratch or rust on the inside. It comes with a case, but the edge of the case is peeling. Quotation: A groundbreaking horn training tool has arrived from Mr. Will Sanders, a professor at the Karlsruhe University of Music! "Big Buzz," an item that can be attached to a horn to practice buzzing and breathing. Big Buzz allows you to adjust the size of the hole to your liking. The larger the hole, the more air leaks out, making it difficult to play the instrument, and allowing you to practice blowing more air into the instrument. After practicing with the hole open, when you remove the Big Buzz and play the horn as usual... ! The resonance increases surprisingly, and you can play naturally.