stainless steel construction. double wall . Will fit most auto cup holders. double wall stainless steel vacuum flask with lid / cupavailabled in any size,350,500,750,1000.Will fit most auto cup holders.Features an easy to use "push and pour" system. FDA ,LFGB approved. Material: Stainless SteelMinimum Production Time:15 day(s)MOQ:2000 pcs