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DOKIO is made from high quality, durable and BPA free 18/10 stainless steel with a sleek satin finish. With the double wall vaccum insulation, the temperature of cold or hot beverages can be remained for a long time. And the surface of the tumbles will not be hot or cold. You can keep an eye on the drink inside through the crystal clear lid. There is a small hole through which a straw can be put in. DOKIO aims to provide qulitified tumbler with nice design. We are the manufacturer so the production can be controlled by a high level of standard. We also have the department of design and engineer so the new models will be developed according to the market. All the customers of DOKIO will have the guarantee. You can replace the tumbler or get full refund if not satisfied.