Peg Nut Fret Strings Sound Hole Bridge Protecting Plate   The Liuyeqin is a small 4-string plucked string instrument with a history of about one hundred years. It was originally used in the accompaniment of folk operas in the An-hui Province of China, but is also used quite often as a solo instrument. Because of its shorter strings & relatively small resonator, the Liuyeqin is noted for high pitches and distinctively bright tones.