1.Material: Made of highquality plastic and premium materials, for durable and nontoxic drinking enjoyment. These colorful mugs are an ideal choice for gatherings and events, with durability and . 2.Deluxe colour changing function: the mug is fun. Add ice water, cold drinks, iced coffee or juice. The cups magically change their colour, and the lower the water temperature, the more pronounced the colour change of the magic cups. Tip: The cups themselves change colour when the temperature drops below 59F (especially in winter). 3.Reusable straws: These lightweight cups with reusable straws make drinking easier. Straws are not lost with accessories, simple and practical! 4.Spillproof design: our straw lid combination provides a secure hold so that nothing is spilled, and the straw even has a cap for additional protection. So you can sip without worry!