Its Made of Stainless Steel Metal with Double-wall Vacuum-insulated Construction to Keep Beverages Cold Up to 9 Hours & Hot for Up to 3. Whether You Are Drink Whisky or Vodka, Rum or Tequila, This Bpa Free High-quality Stainless Steel Metal Wine Glass Will Not Retain Smell or Taste, Making It Easy for You to Switch Wines. Take This Product with You on Every Camping Trip, Picnic, Pool Party, Beach Outing & Car Tail Party. It Adopts Food Grade Silicon, Which is Durable. It Can be Washed in a Dishwasher or Put into a Refrigerator & Microwave Oven. They Will Not Crack, Crack, Shatter, Dent, Fade or Scratch. Minimum Quantity: 50