Schott Zwiesel Banquet Double Old-Fashioned Glasses - Set of 6 Set of 6 Banquet Double Old-Fashioned Glasses. 13.5 ounce Capacity, 3.3 inches Tall. Tritan crystal glass: non-lead material of titanium and zirconium oxide, resists breakage, chipping, scratching, thermal shock resistant. Tritan crystal that maintains its sparkling clarity through years of daily use and entertaining. Patented. Banquet barware collection: features a classic, rounded profile design. Completely dishwasher safe; do not force bowl tightly over dishwasher rack prongs; do not twist stem and bowl while holding one or the other tightly. Made in Germany.