These cold cups are made of high-quality materials, environmentally friendly and durable, BPA-free, reusable, and easy to clean. These tumblers with lips and straws are stackable to save space so that they are convenient to carry everywhere when you go out to play. There are color changes after adding the cold drink. Let’s enjoy the summer with this magic color-changing tumbler. A custom logo is available. The price for over 2,000 pcs is for sea freight.