What can I say other than the best studio musicians in the world still use these mutes and have done so throughout the golden years of the 1940's -1960's. This particular mute is best for jazz and big band but for orchestral music maybe the density would be a little lacking for some pieces of music. They are fairly priced and as far as quality is concerned they are second to none.
All in all a superb economically priced mute.