These are heavy duty 16 ounce double walled glasses. They look very attractive and keep my drinks cold longer than traditional glasses. The shape makes them easy to grasp, and they do not accumulate condensation like other glasses. I love the way the inside is smaller so it looks so cool when filled. They can also hot drinks just as well. You can even microwave and store them in the freezer! These would make a nice wedding or housewarming gift.