Humes & Berg

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Invented in 1935, stonelined are the finest mutes available. They play perfectly in tune, are easy blowing, and provide a wonderful tonal coloring. The formula and process for lining them is a long-held secret. There are many models of stonelined mutes. This one is a classic derby mute for trumpet or trombone.
Humes & Berg 120A Trumpet/Trombone Derby Mute
Humes & Berg 120A Trumpet/Trombone Derby Mute