Pu-erh tea

„Nèi fēi (内飞 or 內飛): A small ticket originally stuck on the tea cake but now usually embedded into the cake during pressing. It is usually used as proof, or a possible sign, to the authenticity of the tea. Some higher end pu'er cakes have more than one nèi fēi embedded in the cake. The ticket usually indicates the tea factory and brand.“

„Pu-erh shape - Brick - A thick rectangular block of tea, usually in 100g, 250g, 500g and 1000g sizes; Zhuancha bricks are the traditional shape used for ease of transport along the ancient tea route by horse caravans.“