Bar Mix Glass, 16 oz., heavy weight, heat treated, (Top diameter 3.50", bottom diameter 2.375"). A great all-purpose glass for beverages, beer, and bar use. Its weight and heat treatment make it more durable, able to withstand the rigors of food service applications and the occasional spill. Libbey Bar Mix Glass. With innovation as its cornerstone, Libbey quality, consistency, and exceptional customer service have become the standard in the industry. Libbey continues to invest in state-of-the-art production equipment and faster and more efficient manufacturing technologies, allowing it to create the most significant introductions in the foodservice and consumer markets.