The Jo-Ral Copper Bottom Flugelhorn Bubble Mute has a unique shape and spun aluminium construction that give it a distinctive tone especially desirable for jazz musicians. This Jo Ral Copper Bubble Mute is made with copper to offer an even warmer sound that is excellent for solo work. 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.