Central Feature is the Newly Developed, Fully Leak-proof Slider Lid, Perfected After an Extensive Testing Phase. the Lid Can be Easily Disassembled into Individual Parts for Thorough Cleaning. the Curve Shape of This Retumbler In-house Development & the Premium Powder-coated Finish Provide a Pleasant Tactile Experience While Protecting the Surface From Scratches & Fingerprints. the Double-walled Thermal Insulated Mug Made From Recycled Stainless Steel Metal Keeps Beverages Hot for Up to 5 Hours & Cold for 8 to 10 Hours. Its Copper Vacuum Insulation Ensures Efficient Thermal Performance. the Sealing Ring & Slider Are Available in 18 Colours, Offering Countless Possibilities for Individual Customization. the 300ml Mug is Dishwasher-safe & Available in Either Black or White. Minimum Quantity: 50.