12 Oz. Double-Insulated Stemless Stainless Steel Tumbler Cup w/ Lids -6 Pack New in Box Color: Rose Gold Insulation structure: extra thermal copper lining conducts even temperature retention that keeps hot beverages for over 3 hours and cold drinks for 5 hours. Vacuum insulation technology: prevents heat from spreading and keeps the outside of the cup at a stable temperature to avoid discomfort. Durable & lifelong use: made of unbreakable 18/8 stainless steel