Innate Commercial Dr 12oz Stainless Steel Vacuum Cup Made With a Premium Korean 304 Stainless Steel That Contains 18% Chromium and 8% Nickel; it Does Not Leach Chemicals, Stain, Corrode, or rust Collar and lid are made from #5 Food Grade Polypropylene Dishwasher Safe Independently tested to USFDA, California Prop.65 and European Norm Food Container Standards.