This is a straight mute for a Jo-Ral tenor/tenor-bass trombone. I purchased it about 10 years ago and used it for 2-3 years, but it has been unused since then and stored in its box. Although it appears to be in poor condition due to noticeable dirt, there are no major scratches or dents, and it is in a condition that is perfectly usable. The cork position and thickness were adjusted to fit the instrument I was using at the time, so replacing the cork and adjusting its position is essential for use. For those who want to try it out or purchase a used one at a low price. Please give it a try. Please consider this item, understanding that it is a used product.