Grant Tenor Trombone Practice Mute - Black This is a practice mute made by Grant. It's the new type with a rough surface. It can be stored inside the bell of the case, and it's characterized by minimal pitch change. The soundproofing seems higher than other manufacturers. There are no sponge chips or damage. There is some slight wear and tear, but I think it can be used without any problems. I think it can be used for various purposes, such as for those who want a mute for warming up, or for students who have decided to go to music college but haven't found a house where they can practice. No claims and no returns accepted. #Edwards #YAMAHA #Bach #Conn #Rittenhouse #GregBlack