Jo-Ral Flugelhorn Copper Bubble MuteEdgy and almost biting, the bubble mute offers and wonderfully distinctive sound. The acoustic design of Copper Bottom Bubble Mute gives it a near perfect intonation across all registers, resounding projection, and an almost meaty buzz unmatched by any other. The Jo Ral Copper Bottom Flugelhorn Bubble Mute has a unique shape and spun aluminum construction that give it a distinctive tone especially desirable for jazz musicians. This Jo Ral Copper