This Jo-Ral Bucket mute is made for tenor trombone bells measuring 8.5"-9". The hand spun aluminum construction make this mute both light and durable. This mute fits inside the bell as opposed to traditional clip-on styles. This fascilitates easier mute changes, and decreases the chances of scratching your bell flare. The tone of this bucket can be changed by taking out or adding of cotton material inside the mute.