357's philosophy of puerh tea and 750's wisdom of grape wine

You know that the common size of puerh cake is 357g. But have you wondered why ? Does 357 mean anything special?

Puerh cakes can be dated back to 2000 years ago although there is no conclusive proof. It’s called Round Tea(Chinese: 圆茶, 即七子饼茶; Pin Yin: qī zǐ bǐng chá ) since Qing dynasty, and Qing government standardized the size of 357 grams for the purpose of easy calculation, which facilitated the transport, convenient trade, taxation and better management. Each tube with 7 cakes is 2.5 kgs, each cake is 357 grams as a result.