Double Wall Vacuum Insulated 18/8 Stainless Steel Tumbler Cup with Copper Lining Keeps Liquid Cold or Hot (20 oz) Stainless steel design with copper lining to keep liquid cold up to 24 hours and Hot up to 8 hours. Cup filled with ice and lid secured placed in room temperature will not began to melt for at least 8 hours, level of heat will not began to diminish for at least 4 hours. 18/8 Food Grade Odorless ,Non-toxic, non-leaching, BPA free meets FDA requirements Stain and rust resistant. CLEAR Heavy Duty unbreakable press-In lid with with rubber seal gasket. . Hand wash recommended. Conveniently fits most car cup holders. Satisfaction Guaranteed! uy in quantity to SAVE: For each additional piece ordered, the shipping cost is only 1.95/pc, on orders shipped in the continental US.