One of the two instruments able to bend pitch, the "suling" is a vertical bamboo flute. "Suling" come in a variety of sizes, from a piccolo-like < 1 ft to a breathy 5 ft. The "suling" section doubles and ornaments the melody; the highest register "suling" has the freest rein to improvise. The player circular breathes to allow the pitch to be sustained into a constant tone. A peculiar quality of Balinese "suling", distinct from Sundanese "suling", is a combined vibrato from irregular flexing of the jaw and working of the tongue.