The Jo-Ral tenor trombone mute is features all-aluminum construction. The acoustic design of Jo-Ral trombone mutes 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. The 8S is a small tenor trombone mute with a bucket. The trombone bucket mute provides a unique haunting sound that is both deep and slightly hollow. This is a specialized mute for a distinctive sound.