It s perhaps the most widely used because of its ability to complement a host of musical styles the French Horn straight mute allows for a free-blowing sound in all registers providing a consistent flow quality that allows musicians to achieve a delicate controlled sound without transposing registers. The Jo-Ral FR-AC Copper Bottom French Horn Straight Mute is made of spun aluminum and has been tested to perform evenly in all registers. Finished with a copper bottom producing a powerfully dark and rich sound. Jo-Ral mutes also feature neoprene-enhanced composite cork pads that provide extra durability. The result is a more pliable cork that grips well and doesn t dry out become brittle or break off-so it lasts longer while easily accommodating fine adjustments for a perfect fit. Features: • Crafted from lightweight spun aluminum and copper • Great for that classic jazz sound • Near-perfect intonation • Pliable neoprene-enhanced composite cork pads offer lasting durability and grip • Soft felt cap for extra protection • Made in the USA