This In-house Development Stands Out with Its Modern Design, High Insulation Performance & Practical Click Closure. the Special Feature is the Convenient One-handed Operation: a Simple Press on the Button on the Lid is Enough to Open or Close the Drink Opening. the Double-walled 280ml Thermo Mug with Copper Vacuum Insulation Keeps Your Drink Warm for Up to 4 Hours or Cold for Up to 24 Hours. the Screw Lid with a Deeply Embedded Silicon Seal Enhances the Insulation Performance & Ensures Leak-proof Security. Thanks to the Powder Coating or Anti-fingerprint Coating, the Mug Feels Comfortable in the Hand & is Protected From Scratches & Fingerprints. While the Mug is Made From Recycled Stainless Steel Metal, the Lid is Made From Recycled Polypropylene Plastic. Available in Black, White, Silver. Minimum Quantity: 50.