the Ceramic Inner Coating Offers Many Advantages: It Ensures an Unaltered Taste of Your Beverages, & as an Extra, You Can Choose a Clear Transparent, BPA-free Push-on Lid & Customize the Closure Colour. the Insulation Keeps Your Drink Warm for Up to 4 Hours or Cold for Up to 24 Hours. the Mug Set Interior & Exterior Colours Are Harmoniously Coordinated: the Red, White & Dark Blue Mug Set Have a White Inner Coating, While the Black Version has a Black Interior. the Double-walled Thermo Mug is Made From Recycled Stainless Steel Metal & Features a Durable Powder Coating. Optionally, You Can Choose a BPA-free, Leak-resistant Push-on Lid Made From Recycled AS & PP Plastic. the Practical Sliding Closure Can be Colour-configured: Choose From 17 Trendy Colours & Design the Item According to Your Style. Available in Black, White, Dark Blue, Red. Minimum Quantity: 50.