Drinking cups are made of many materials, such as stainless steel, plastic, paper cups, ceramic, glass, etc. Personally, I thought it was best to drink from a glass cup or ceramic cup. Glass cups do not contain organic chemicals in the firing process, and glass cups do not appear because the water temperature is too high and related toxin release, very safe. Glass surface is smooth and easy to clean, especially bacteria, dirt, etc. is not easy to breed in the glass cup wall, drinking from a glass cup is very healthy and safe. Ceramic cups and glass cups have similar characteristics, however, many ceramic cups are easy to add harmful glaze in the firing process, easy to make the lead content is too high, so the best in the selection process is glass cups, followed by ceramic cups.