Jo-Ral Bass Trombone Cup MuteJo Ral B7 Bass Trombone Cup Mutes are made of spun aluminum, and have been tested to perform evenly in all registerscreating an exciting tonal quality that results in near perfect intonation. Jo Ral mutes also feature neoprene enhanced composite cork pads that provide extra durability. The result is a more pliable cork that grips well and doesnt dry out, become brittle or break offso it lasts longer while easily accommodating fine adjustments for a
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