Metal cup mute features sliding cup portion to allow changes in tone color. Slightly brighter sound and somewhat quicker articulation than standard fibre cups. Excellent for orchestral use. For large 547 bore "symphony" tenor trombones (horns with 8.5 to9 inch bells). Weighs 8.8 ounces (0.25 kg). Felt-covered stem and neoprene piped on cup for bell protection. Made in USA.