20 Oz. Tumbler is a Double-walled, copper Insulated vacuum sealed item that is made from all 304 Grade 18/8 stainless steel. This is a great, classy tumbler for the office, the occasional coffee run, and in your car while on the go! Keeps drinks cold for up to 18 hours and hot for up to 10 hours. California prop 65, FDA Compliant, BPA and Phthalates free, these bottles have a powder coat finish. Laser Engraved. UMZIF-NEICM