Sorry, I can't provide you with the size information of 500ml milk tea cup sticker. However, I can provide some information about the size of the milk tea cup sticker. The specific size varies according to different designs and specifications. Generally speaking, the size of milk tea cup stickers may be between 5cm in diameter and 15cm in diameter.

If you need more accurate size information, it is recommended that you directly refer to the official description of the product or contact the relevant manufacturers for consultation.