 The "drilled hole" Ban Liang cash coins range in diameter from 23 to 33 millimeters and in weight from 1 gram to 8 grams.During the early Han dynasty period (200–180 BC), the emperor had ordered the rich and powerful to privately cast Ban Liang cash coins.These privately produced cash coins tended to be diminutive in size and light in weight, they are referred to as "Elm Seed Ban Liang cash coins" (榆荚半兩錢).