Add a dose of presto change-o to your refreshment when you serve up the drinks in these cool color-changing cups. Made of plastic, these kid-sized cups have a magical secret. Just fill them with your favorite cold drink and watch the color change — as the temperature rises, they return to their original color. A great idea for birthday parties, picnics and other celebrations, Available in assorted base colors — add your school, sports team, organizational or company logo or message to customize.