In the first year of Tianfeng (AD 14), Wang Mang carried out the fourth currency reform, changing the coins made of "valuables" into coins made of "article springs" and "cloth". The diameter of commercial springs is generally 2.2~2.4 cm, and the middle is about 2.8~3.6 g; Most of them have inner and outer contours. The word "fire spring" is a pin print, and the vertical pen in the word "spring" is broken. The initial casting is excellent, weighing more than 5 grams. In the middle and late stage, it was light and small because of indiscriminate casting and private casting.

There are many versions of the ring of fire, such as biographies, different books, back-to-back, round back-to-back, horizontal engraving, star and moon patterns, and all dynasties are tired to win money.

Buquan is more formal, handed down slightly less, around 20 yuan.