The lid is made of food grade PP, drink more healthy, more environmentally friendly; inner ring with food silicone, non-toxic and tasteless, high temperature hot and cold. Smooth rounded anti-hot cup design to give lips appropriate temperature and texture. Unique reinforcement at the end of the cup, placed more stable, the bottom of the paste with genuine certificate, genuine guarantee! Can be safe to buy! Outer quality stainless steel, 304 stainless steel liner!