Jo-Ral Trombone Straight MutesThe acoustical design of Jo Ral Trombone Mutes creates an exciting tonal quality celebrated by even the most discerning musician. Choose from a host of different styles, each with a unique, dynamic sound guaranteed to add even more dimension to your tone. 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 doesnt dry out, become brittle or break offso it