Premium QualityDouble-layer of the insulated coffee cup is made of high quality 304 stainless steel, with BPA-free & leak-proof screw lid. Advanced internal seamless technology can lock the temperature better and more durable than other cups with welding gap, hot and cold drink can be kept for more than 6 hours. Fashionable & Comfortable Coffee CupFashionable appearance of ergonomic design and frosted surface make you more easy and comfortable to hold the cup, not easy to slip off. And bottom of the coffee mug has a rubber anti-slip mat for extra stability. Easy To CleanFood grade stainless steel inside, so the drink will not stick to the cup during use. The lip of cup with large diameter makes it easier to clean the inner wall. Lightweight & Travel SizeSize of 510ML is 17CM*9CM. About 260g for 510ML. You can choose the size that suits your needs. Professional Customer Service1 year guarantee, 100% satisfaction and worry-free money back. We have a professional customer service team, if there is anything wrong, please contact us for perfect after-sale service. NOTE: Please do not put the travel mug into the Dishwasher or Microwave.