What is Qi Zi Bing? Why Are Pu Erh Cakes 357 Gram?
You've probably noticed that the title of this post contains 2 questions. The reason we put them together because they're very much related.
The reason why pu erh tea cakes often weight 357 grams and why they're often packed per 7 pieces is related to the measurement unit used in China.
In China, the main measure isn't kg or oz, but 'jin' (斤) which is 500 grams.
A pu erh tea cake is often pressed in 357 gram cakes. And because they're often packed per 7 pieces, they're often called 'qi zi bing' which literally translates into '7 cakes'.
If you now multiply 7 by 357 grams, you've 2499 grams. Which is 2.5 KG or 5 'jin'. We all love round numbers. So this explains why pu erh tea cakes are 357 grams and packed per 7.