An adjustable cup Trombone mute that has a bright projecting sound. Perfect for 40's and 50's jazz & big band performances. Create your unique sound by sliding the cup to match the tone you are searching for. Aluminum body with a red-painted metal cup. Cup is lined with thick felt and has a rubber gasket around the rim. Cup adjusts easily back and forth along the body up 1.5 inches (35mm), and stays in place once set. Well built and lightweight.