Schott Zwiesel Tritan Pure Longdrink - Set of 6 Set of 6, 18.3 oz, 6 1/2" high. Pure glasses, With their distinctive angular design, from Schott Zweisel make a sophisticated showcase for cocktails and juices, lemonade and iced tea. Both beautiful and extremely durable, they're made from Tritan crystal that maintains its sparkling clarity through years of daily use and entertaining. Sculptural tall tumblers combine the beauty of crystal with unsurpassed durability. atented Tritan titanium technology creates break-, chip- and scratch-resistant stemware. Made in Germany by Schott Zwiesel, famous for fine glassware innovations since 1872. Lead-free. Dishwasher safe.