Come and see our amazing products. This wonderful tumbler are made of food-grade plastic materials and BPA free.You will find the cups change to different color magically with adding your favorite beverage or ice water (below 59 Fahrenheit degree) into the tumblers. That's pretty cool. It will make your holiday and summer more colorful. Could be customized. Pls confirm further with us if any query about packing info, inventory status and time schedule.