The label of each brand can represent different meanings, but it can be roughly divided into the product (such as the difference between Dunhuang A and AA), the trademark representing the product (Zhengyintang 1345 6897 12) and the serial number of the product (meaning that the number in front stands for mahogany or the red sandalwood in the back stands for fine products or the best). Others don't think it is necessary to pay too much attention to this.