Stainless steel mug with double-wall vacuum construction, keeping cold drinks cold for 9 hours and hot drinks hot for 3 hours. I received this as a wedding gift about a month ago, but it doesn't match the atmosphere of my home, so I'm selling it. It is unopened. * I have identified the product based on information from the person who gave it to me and the text on the box, but since it is unopened, I cannot guarantee that the contents are exactly the same as the photos. Please understand this before purchasing. - Color: Black and Rose Gold - Material: Stainless Steel - Insulation: Double wall vacuum, keeps cold for 9 hours and hot for 3 hours - Brand: Nebttl Thank you for looking.