Colour Changing Cup:The Colour of These Plastic Cups Will Change Magically As Soon As The Iced Drink Hits The Cups, The Lower The Water Temperature,The More Obvious The Colour Changing Effect, Kids Will Be Very Excited About How The Colors Change with Cold Liquid In Cups, This Is A Very Interesting and Magical for Them,These Kids Tumblers with Lids and Straws Can Help Them Drink More Water.Tips: When The Temperature Is Below 59F, The Cup Itself Will Also Change Colour (Especially In Winter) . Different Colours Every Day: 7 Colour Changing Tumbler with 7 Different Bright Cute Colour Changing, Kids Have Different Colour Everyday, It'S Amazing. In Addition, They Can Mix and Match with The Different Colour Lids and Straws Or Decorate These Cute Cups with Their Favorite Adhesive Vinyl, That'S Perfect for Playtime, That'S Funny and Your Kids Will Love These Kids Cups with Straws and Lids . Personalize Cups for Gifts & Party : These Magical Colour Changing Cups with Lids and Straws Is Great Gift for Your Kids Or Friends, Your Children Or Friends Will Be Surprised By The Colour Changing. These Plastic Tumblers Is Also Very Suitable for Party, Such As Birthday Party, Family Gathering, Cinema Room, The Eye-Catching Colour Changing and Rich Colours Will Impress Everyone and Make Your Party More Interesting.The Different Colored Cups Can Prevent Everyone from Mistaking Each Other'S Cup . Satety & Easy to Clean: These Plastic Cold Tumblers Are Made of Bpa Free Food-Safe Grade Materials and Splash-Proof Design.Non-toxic and Environmentally Friendly, Please Rest Assured to Use. The Reusable Plastic Tumblers with Lid and Straw Are Very Easy to Clean with The Straw Brush and Sponge It Comes with and It'S Dishwasher Safe . Easy to Use & Travel-Friendly: These Clear Plastic to Go Tumblers Are Stackable for Save Space and Easy Storage, So They Are Perfect for Your Travel. Each Cup Features A Child-Proof Straw Lock So That Straw Will Not Slide Out When In Use. It'S Funny Travel Mugs. Tips: Put Your Two Palms On The Edge of The Lid, and Just Need to Apply A Little Bit of Pressure to Close The Lids Well and It Will Clicks In .