There are standards. Because the AliExpress platform requires merchants to label products, including size labels. The specific regulations of the AliExpress label size standard are: the label size should be greater than or equal to 20mm x 40mm, and the label must have the product's size information and brand information. In addition, merchants also need to label products according to relevant national standards to ensure that the products meet relevant standards and regulations and meet quality and safety requirements. Therefore, when selling products on AliExpress, merchants need to follow these standards and regulations and make correct product labeling and instructions.