20oz tumbler is with double wall vacuum technology to keep drinks hot for over 6 hours and cold for around 24 hours. .The tumbler is made from high quality 304 food grade stainless steel and durable pp. Lead free and durable. Rust-proof, easy wash and unbreakable. Sweat proof, easy grip, the advanced technology prevents heat transfer to outer wall, condensation free and long lasting. Electro polished inside delivers elegant look. Designed for car cup holders. BPA Free Sliding Lid, Eco-friendly and Extra sealed and the lid cover provide maximum splash-proof capability. Drink hole on the lid for easy sipping. More information, please send your detailed request for quotation. Measuring 3.34*7.08 inches, this custom multi-color black inside tumbler 20oz. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. We offer logo printing and full packaging customization. Product Highlights: BPA-free, leak-proof, travel-friendly.