Sihu
From Wiki China org cn
A four stringed huqin used for accompanying local opera, most commonly found in the north, such as Shanxi, Shaanxi and Inner Mongolia. It is one of the three leading instruments (together with dizi, yangqin) in Er ren tai of Inner Mongolia. The structure is similar to erhu except it has four strings. The horse-hair of the bow is divided into two groups that go between the four strings.
