Swords have a long history in China. Bronze swords have been traced back to the bronze daggers of the Shang dynasty. Bronze long swords suddenly appeared during the mid-third century BC. Later swords were made of iron or steel. These metals were wrought, never cast. Swords commonly reached a length of 70–100 cm, although longer swords have been found. Chinese iron swords were used in Japan from the third to sixth century AD, but were replaced with Korean and native Japanese swords by the middle of the Heian era.
The Chinese classify all swords into two types, jian (劍) and dao (刀). Jians are dual-edged while daos are single-edged.
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Historical one-handed versions have blades varying from 45 to 80 centimeters (17.7 to 31.5 inches) in length. The weight of an average sword of 70-centimeter (28-inch) blade-length would be in a range of approximately 700 to 900 grams (1.5 to 2 pounds). There are also larger two-handed versions used for training by many styles of Chinese martial arts.
In Chinese folklore, it is known as the "Gentleman of Weapons" and is considered one of the four major weapons, along with the gun (staff), qiang (spear), and the dao (sword).