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316 Stainless Medical Grade Steel.This wide mouth thermos greatly outperforms 18/8 food grade stainless steel in anti-oxidation and corrosion resistance, it will never leave a metal taste or rust. 
Anti-slip, coated with high-quality powder outside protection for scratches and dings, and also prevents to sweat on the outside wall. High performance temperature retention, keep liquid hot and cold up to 24 hours. 
This wide mouth thermos is designed with light weight, and the middle size cup body is equipped with silicone rope, which is convenient to carry.