Ultimate Whiskey Set. Two distinctively classic on-the-rocks glasses are paired with two spherical ice molds to create the Ultimate Whiskey set. The set has all the right tools to give your spirits the perfect chill. The two ideal whiskey glasses are made of Schott Zwiesel Tritan™ lead-free crystal glassware, which has added zirconium for clarity and added titanium for strength. Schott Zwiesel® delivers unparalleled quality and brilliance for years of enjoyment.