The Libbey 29411HT has a double ring base design to ensure the durability and quality of the glass while a chip proof rim extends the lifetime. An excellent clarity makes any beverage you choose shine through while a capacity of 12 ounces ensures ample room for any sized event. The twisting pattern adds edge and grip to the beverage holder while a rounded rim makes drinking easy. Strength is added to the glass by being heat treated and also resistant to both chemical and mechanical shock. After you're through using the glass simply put it in the dishwasher fora clear, durable experience again.