The TrumCor Aluminum Tenor Trombone Straight Mute is equipped with a new venting design concept that reduces air flow resistance, resulting in superior response and projection of sound from pedal notes on up. TrumCor Mutes are carefully crafted from selected grades of materials. Each mute is designed to produce a muted tone that is in tune, vibrant, warm and responsive. TrumCor Mutes blend well with other instruments and preserve the unique sound quality of each instrument in all registers and at all dynamics.