This Marka Copper Vacuum Insulated Tumbler features durable, double-wall stainless steel vacuum construction with copper insulation, which allows your beverage to stay cold for 24 hours and hot for at least 8 hours. The tumbler has a powder-coated finish and a push-on, see-through, spill-resistant lid with a silicone closure.The reusable straw is made of 18/8 food grade stainless steel material and is perfect for drinking cold beverages. The straw has a silicone tip for a comfortable sipping experience.The stainless steel straws are reusable and dishwasher-safe.