Pottery cups are the safest. For example, purple sand cups. Disadvantages-this kind of cup is generally rare and expensive, and generally small, not suitable for daily drinking.

Glass is also very good, although not as good as pottery cups, but it is also very safe. Moreover, it is cheap and has many kinds, which is more suitable for daily use. Like double vacuum cups (insulation), there are glasses of various calibers and styles.

Followed by wooden cups and porcelain cups. When there are many elements of art appreciation. Moreover, the porcelain and paint (wooden cups) outside are harmful to health.

Note: Although most health cups are stainless steel cups. But the actual function is the same as glass (heat preservation, tea making), with high price and few styles. It is no longer popular in the market.