The Humes & Berg Stonelined Tuba Mutes have been the standard in mutes for many years. The Stonelined Series features fiber construction in red and white. The Stonelined Symphonic Series features aluminum construction. These mutes are built for excellent intonation and free blowing style. The Humes & Berg Stonelined Tuba Mutes are available in a variety of styles to meet the needs of players.