Shaanxi Ankang dialect (Tiegedou) means iron ball. Iron lump is a proper term for smelting ore, which means that iron ore forms lumps in the ironmaking boiler and accumulates on the boiler wall. If there are too many iron blocks in a boiler, it will make the boiler unable to produce, because the iron blocks will continue to grow, which will eventually make the boiler need to be scrapped, thus hitting production. In the past, "big steelmaking" failed because of this.

Iron ball began in the Song Dynasty. At first, it was a solid ball, also known as an iron egg. This is a kind of weapon for both fitness and self-defense. According to the data, the solid ball was changed into a hollow ball in Jiaqing period of Ming Dynasty, and it became popular in Qianlong period of Qing Dynasty. Its function of dredging meridians and activating qi and blood by stimulating hand acupoints is gradually recognized by people.

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Baoding, China is the main production base of iron balls in China at present, and it is one of the "Three Treasures of Baoding". The present iron ball is developed through improvement and innovation on the basis of ancient production technology in Ming and Qing Dynasties, with finer technology and more scientific structure. The materials of the ball are more diverse and the surface patterns are richer.

The internal structure is becoming more and more complicated. There are balls with soundboards, and two are a pair. Baoding iron balls are mainly divided into ordinary fitness balls, colored balls for young people and fitness balls for old friends. Holding it in your hand, the voice goes from high to low, which can not only adjust your body and mind, but also cultivate your temperament in the crisp and pleasant voice of the iron ball.

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