Created by Yamaha's wind instrument design team, the pickup mute is made of lightweight plastic with a unique rubber sealer to hold it securely in the bell. When used with the Silent Brass System, it has none of the stuffy restricted feeling of a conventional practice mute. In fact, it blows so close to a natural open horn that you simply won't believe it until you actually experience it for yourself. Play high or low, loud or soft, and your pitch will remain true and centered. A special microphone inside the mute relays your sound to the Personal Studio.