Description from Amazon USA : Spun aluminum with a distinctive black textured finish, dramatically reduces volume without distorting tone quality, for quiet practice sessions. The Jo-Ral 4P Bass Trombone Practice Mute creates an exciting tonal quality that results in near-perfect intonation. They are made of spun aluminum, and have been tested to perform evenly in all registers. Many models are also available with brass bottoms-offering a slightly warmer, moderately dark sound, or with copper bottoms which produce an even warmer, darker, rich sound.
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