The Jo-Ral Tri-Tone Trumpet Cup Mute creates an exciting tonal quality that results in near-perfect intonation. Jo-Ral Tri-Tone mutes are made of spun aluminum, and have been tested to perform evenly in all registers. Many models are also available with brass bottomsoffering a slightly warmer, moderately dark soundor with copper bottoms which produce an even warmer, darker, rich sound. Three distinctive sounds from a single mutethat"s what the Jo-Ral Tri-tone mute delivers. Specifically designed to provide exceptional versatility in artistic expression, this all-aluminum mute includes two felt rings that can be inserted to create different sounds. With one felt ring inserted, the result is a softer, less brilliant sound than the mute alone provides. With both rings inserted, the sound is softened even further.