Come and Check Our Branding Solutions.The wine glasses are made of high quality stainless steel, BPA free,lead free,durable and not easy to break.The glass is covered with a tough,durable coating that won't scratch,and the glass is dishwasher safe without changing flavors or leaching chemicals.But to protect the coating,you'd better wash it by hand.Its double-wall vacuum insulation technology keeps your beverages fresh whether it is hot or cold drink inside.Set off on your refreshing picnic,hiking,camping,home or office with your water,drinks, wine or cocktail icy-cold for 7 hours or your coffee and tea scalding-hot for over 5 hours! Pls check inventory and detailed info before placing your orders.