Rolling circle is an ancient game for Han children, which was very popular in China in 1960s and 1970s. Players hold U-shaped iron bars or wires and push a black iron ring with a diameter of about 66 cm to run forward. Some also put two or three small rings on the iron ring to make the sound louder when rolling. Make a circle with wire, then make an iron hook with a long handle and push the wire circle away. The movement of the iron ring is difficult and requires certain skills.