Specifications:Material: liner: 304 stainless steel, shell: 201 stainless steel - Size: 380ml: 70 × 145mm, 510ml: 70 × 170mm - Insulation performance: 6-12 hours - Features:Quality and Durability: this vacuum coffee cup is made of durable stainless steel interior and exterior, with food grade pp lid. It’s 100% BPA free, eco-friendly, durable and built to withstand the demands of everyday use. - Leak-proof Lid: The silicone seal ring on the lid ensures great leak-proof performance, opening small hole for easy drinking. One-button operation, effectively prevents any accidental leaks or spills. - Stylish Design: Compact and lightweight, fits most cup holders. The silicone textured band of the surface makes this cup easy to grip, non-slip base prevents the coffee mug from sliding or tipping over. Wide opening makes it easy to clean and add ice cubes, meanwhile hard to breed bacteria. - Long Heat and Cold Retention: Double-wall structure for maximum temperature retention, keeps hot/ iced beverage for hours. Pour hot or iced coffee in your vacuum insulated coffee mug and feel energetic all day. - Surprise Gifts: Perfect gift idea for Christmas gifts, Birthday Parties, Weddings, Graduation, Retirement, or Moving house. Also great for drinking tea, coffee, espresso, water, etc. Carry your beverages in the office home gym, or on road trips. - Packing includes:1 X Coffee cup with lid