 At Zhangpu in Shaanxi, just such a sealed jar, containing 1,000 Ban Liang of various weights and sizes, was discovered.7 Ban Liang were found in a tomb datable to 306 BC.At the beginning of the Western Han Dynasty, c. 200 BC, the people were allowed to cast small light coins known as "yu jia" (), "elm seed" coins, as the heavy Qin coins were inconvenient.