Jo-Ral FRC All Copper Non Transposing French Horn Straight Mute FRC All Copper Non Transposing French Horn Straight Mute The Jo-Ral All Copper French Horn Straight Mute is built to the Jo-Ral standard of excellence The FRC features a free-blowing sound in all registers for a consistent flow quality with a controlled sound The straight mute also features a non-transposing design plus high quality synthetic cork for an exact fit in any model French Horn The Jo-Ral All Copper French Horn Straight Mute is built to the Jo-Ral standard of excellence