World-renowned bartender and author of American Bar, Charles Schumann and German glassmaker Schott Zwiesel bring you the ultimate collection for the bar. Each piece is brilliantly clear, lead-free Tritan crystal, break-resistant and dishwasher safe. The design follows the ambition that each glass underlines the specific character of its respective drink. The 12-oz. whiskey tumbler is subtly tapered with a thick base—a time-tested shape perfect for an old fashioned or whiskey