This is a warm-up mute for trombone. I am selling it because I don't have a chance to use it. It has a moderate resistance, making it ideal for playing in the wings of a stage or at home. It is lightweight and does not interfere with practice, and the intonation is also relatively natural. There are no major dents, but there are some minor scratches. I think they can be cleaned with a fine-grained polishing compound, but I will hand it over as is. - Brand: Best Brass - Type: For trombone / trombone / (According to the manufacturer's website, it can also be used for flugelhorn) - Material: Aluminum I will use recycled packing materials. I usually ship within the next day, but it may take a few days depending on work or other circumstances. Please let me know if you are in a hurry.