This 17 oz Serendipity Bottle with Speaker Lid is made of high-quality vacuum-sealed 18/8 stainless steel, including a double wall and copper liner for optimal insulation. With a wide mouth opening and electroplated color options, this bottle keeps your beverages cold for 24 hours and hot for 12 hours. Plus, it features a built-in Bluetooth speaker in the lid, making it the perfect choice for on-the-go hydration and entertainment. Please note that there may be slight variations in color due to the electroplating process.