Thank you very much for viewing. This is a straight mute for bass trombone by Jo-Ral. I purchased it over a decade ago and used it for several years. As a result, there is significant white rust characteristic of aluminum. I cleaned (polished) it as much as possible, but couldn't remove it completely. Additionally, there is a small dent in one place (see the arrow in the image), but I believe it is still usable even considering that. One of the three corks has come off, but I have left it off because it is necessary to adjust the corks to fit the instrument. If you'd like to try it out, want to get it cheap, or understand that it is a used item, please consider it. Thank you very much.