This Tom Crown all-aluminum straight bass trombone mute offers classic straight mute tone with a slightly brighter edge. Great projection, ideal for all trombone players.Tom Crown is considered one of the finest mute craftsmen around today. The products he has developed are top professional level and extremely well manufactured. They produce a unique, lovely sound and still allow the power necessary in large ensembles. Once you try these you will see why they are the professional choice.