The Balu XL Series Tuba Straight Mutes offer a fiberglass construction covered with an attractive wood veneer finish. The Balu Tuba Mutes include three different thickness of mute cork that attach to the side of the mute with Velcro, allowing the player to adjust the fit of the mute to their particular instrument. The Balu Tuba Mutes are designed so the player can use the same mute on different instruments by simply switching the corks. The Balu XL Series Tuba Straight Mutes are recommended for use in 5/4 and 6/4 tubas and offer excellent intonation and clarity in all registers.In collaboration of top musicians and artists, Balu Mutes are able to provide some of the world"s best mutes, including a Horn practice mute with negligible air resistance. Balu Mutes manufacturers mutes for Horn, Trumpet, Trombone, Euphonium and Tuba.