It's Magic! Add your favorite iced beverages and the cups will magically change color! Travel Ready: Threaded Lids twist on to ensure kids of all ages stay splash free! Drink from the straw or directly from the lid. Fun choice for school or daycare. Kids get to pick their favorite cups and straws to mix and match. Easy to Clean Design: All parts are top rack dishwasher safe and BPA free. Peace of Mind: Ello is proud to stand behind every Ello product and more than anything, we're here to make you happy. Ello's Lifetime Guarantee protects purchases from authorized retailers.