It must be milk. Most of the milk balls are synthetic milk, which is rich in cyanogen oil and essence thickening. Although it feels fragrant, it is too harmful to human body, and his image is mostly essence-flavored. In fact, it doesn't matter what brand of milk. Coffee shops choose milk because milk foam is more stable. Flavor is not the most important thing, just like it. Sugar is ok, syrup is characterized by easy dissolution and low sweetness, which is irrelevant to hot coffee.