The erhu is a traditional Chinese two-stringed bowed instrument known for its expressive, voice-like sound. The erhu is a member of the huqin family and is often referred to as the Chinese two-string fiddle, though it functions differently from a violin. It has two strings, a small resonator, and a bow that passes between the strings. The soundbox is covered with a stretched membrane, traditionally snakeskin, which acts as the vibrating soundboard. A small bridge transfers string vibrations to the membrane, while the wooden resonator shapes the tone and projection.