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Stainless Steel Vacuum Flask Set with 2 Stainless Steel Cups Combo - 500ml When loading liquid, make sure that the lid of the cup is tightened to prevent water leakage. Do not load corrosive liquids or strong acid liquids. After use, please wash it with clean water, and store it after natural air-drying to prevent rust and affect its service life. Use soft cleaning utensils such as cup brushes and sponges. Twisting and dumping function 18/8 Stainless Steel Flasks are made from premium 18/8 (304) stainless steel that is Free of BPA,Your drinks will stay pure, natural, and odor free. Double wall design Vacuum Insulation Creates an airless space between two walls,virtually eliminating the convection process and temperature change.This design will keep hot things hot and cold things cold.