Thank you for viewing. This is an up mute for tenor and bass trombones. It can be used not only for muting but also effectively for warming up. The cushion part is made of high-density urethane. Lightweight and compact. It can be carried around while attached to the bell. I used it a couple of times after purchasing it and have been storing it at home. There are no dents, but there are areas that look like white scratches (see photo 4). There are also small scratches from normal use. Please ask if you have any questions.