The Humes & Berg Stone Lined 152 Cup Trombone Mute is a standard in the brass world, known for its rich, "big open" cup tone and excellent intonation across all registers. Invented by Willie Berg in 1935, these mutes use a proprietary "secret formula" lining that makes them easy-blowing and professionally tuned.

Key Features
Design: A classic cup design that produces a warm, woody sound—less piercing than a straight mute—making it ideal for jazz ballads, big bands, and orchestral passages.
Material: Constructed from a durable, lightweight fiber composite (often referred to as stone-lined).
Compatibility: Specifically designed for tenor trombones with bell sizes up to 8.5 inches.
Performance: Highly responsive in various registers, allowing for clear phrasing and vibrato.