【Product Description】: Excerpt Groundbreaking horn training equipment has arrived from Mr. Will Sanders, a professor at the Karlsruhe University of Music!! This item, "Big Buzz," can be attached to a horn for buzzing and breath control practice. Big Buzz allows you to adjust the size of the hole to your liking. The larger the hole, the more air leaks, making it harder to produce a sound, which helps you practice putting more air into the instrument. After practicing with the hole open, remove the Big Buzz and play the horn as usual...! The resonance increases remarkably, allowing you to play naturally. ◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆◇◆ I am selling this because I no longer use it. I used it with an Alexander 103. There is some slight rust on the shank, but it does not affect its use at all.