How many hairs does Gong have?

About 200. According to the information about Jinhu Bow, there are about 200 Jinhu Bows, and the traditional musical instrument Erhu Bow hair is 280~300 according to craftsmen. This is what I heard from my professional teacher when I bought erhu. It is said that the pronunciation is too brittle, too much is boring, and the white horse tail hair is the best, and the bow is more than 80 cm long, so the good pronunciation of erhu has a lot to do with the bow.