Come and see our amazing products. Just add cold water or your favorite iced drinking in these plastic cold tumblers, you will see funny color-changing in these cold cups. TIPS: When the temperature is low and below 59 F, the tumbler cup itself will also change color (especially in winter).These tumblers cups, lids and straws are made of BPA-free food-safe grade materials, the splash-proof design lids help to reduce spills and messes, please cover cups lids with a little strength for spill-proof; the plastic tumblers are easy to clean and you can simply put the straw cups into your dishwasher after use.The tumblers are the best gifts for your kids, families and friends.Customized Logo is available. Pls confirm further with us if any query about packing info, inventory status and time schedule.