All vacuum flasks and vacuum bottle of Gven series are made of high quality stainless steel with сoated exterior. Double-walled liner for perfect vacuum isolation keep beverages hot for up to 12 hours and cold for up to 24 hours. Thermal flask of high quality stainless steel 18/10. Air tight screw plug with silicone rim sealed for the full leak-proof protection. Convenient valve for pouring could be fixed in the open position. Lid-cup and additional cup of vacuum flasks are made of BPA free food plastic. Vacuum bottle is equipped stainless steel hang for handling. Guarantee on Gven series cookware is 5 years.