Very good sounding mute. You can use it as a straight or cup mute if you are fast enough and the music permits. Adjustable cup is excellent, but plastic rim on edge of cup loosens. You will need to glue this on. The neck of the mute has a one inch covering of thin felt-like material. It is too thin to protect against mute dings and denting. If you glue a thin ring of cork around the mute opening, this will solve both of the above problems. The sound will still be very good. All in all, a superior mute once these defects are fixed.