The Humes & Berg Cornet / Trumpet Cup Mute - Stonelined plays with rich, big open cup mute tones. it is free and easy-blowing in all registers.Excellent intonation for solo or section work. You´ll experience a command performance. There is nothing like a Stonelined cup mute sweet sound.Willie Berg invented Stonelined Mutes in 1935. They are the finest Brass Instrument Mutes available in the World.Sonelined Mutes play perfectly in tune and are easy blowing. For the perfect professional sound all the time, our line of Stonelined Mutes offers many different models to produce outstanding various tonal colors for the Brass player.Included in the many Stonelined Mute features that allow the outstanding colors of sound is the secret formula used to line each and every Stonelined Mute.