Not like cheap thin, or colored plastic cup, this plastic glass is made of food-grade, 100% non-toxic; it will not harm human health; crystal-clear, with the look and feel of glass, but without any of the risks of glass.3.3mm thick cup wall with round and smooth rim, won't hurt your lips and fingers; stand up properly, no excess plastic on the flat bottom; acrylic tumblers can be stacked and stored without taking up extra space.