Niutouxun, a folk musical instrument of the Hui people, commonly known as "Wow" or "Muxiao" by the Hui people, is a small folk musical instrument made of yellow clay with strong adhesion and durability. It was called "Xun" in ancient times.

Niutouxun is simple to make, easy to obtain and popular. Children between the ages of seven and eight to eleven and twelve in the Hui area, like to play with clay to make "Niutouxun". As long as they have time, they dig a piece of plastic soil by the river or the canal, stir and knead it into a mud ball, and then make it into various shapes such as round, egg-shaped, butterfly-shaped, fish-shaped, cow-head-shaped, etc. After drying, use a thick iron wire or thick splendens stalk to drill several small holes. There is a mouthpiece and four small mouths for hand pressing. Some competitive children also use oil to rub the shape of this "mud wow" to make it smooth and shiny, and some even put it in a brick kiln for burning, which is strong, durable and beautiful after burning.