Hi-Ball Glass, 7 oz., DuraTuff, GIBRALTAR, (Top diameter 2.625", bottom diameter 2.25"). Libbey Hi-Ball 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.