Stainless Steel Metal Drinkware Uses Double-wall Vacuum Insulation Technology, Meaning Space Between Stainless Steel Metal Walls is Void of Matter. with No Medium for Heat to Transfer, Your Drink Thermometer Wont be Impacted by Outside Thermometer. All Drinkware is Bpa Free, Fda Approved, Highly Resistant to Rust, Absorbing Odour, Retaining Taste & Bacteria, & Easy to Clean by Hand. Colours Available: Red, Silver, Yellow, Blue, Rose Red, Pink, Black, Light Blue, Purple, Orange, Green, Brown, Light Green. Minimum Quantity: 100.