This is a mute for tenor and tenor bass trombones. I purchased it new in 2015. I have only used it a few times. Due to aging, there are some cracks in the cushioning material where it contacts the bell (see image 5). There is no problem with its usability. Please understand that this item has been stored by a private individual. Brand: BEST BRASS Product name: e-Brass Jr. for Trombone EBJ-TRB