The 120B features a durable fiber construction with a felt-lined interior to absorb the sound. The 120B also features a corrugated rim that makes this mute easy to maneuver over the bell in any direction.
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Comments about Humes & Berg 120BK Stonelined Series Black Trombone Derby Mute:
one ansi-standard derby mute just like every other big band uses. But unlike the picture, it's black. White-hat tenors, black-hat bass? Fits with operatic convention, I guess.