Schott  Zwiesel Tritan Crystal Siza Port Wine Glass, 7.7-Ounce, Set of 6 6 each Tritan crystal stemware official Port wine glasses; 7.7-ounce capacity; 6.6-inch tall, 2.8-inch wide Tritan crystal glass: non-lead material of titanium and zirconium oxide; resists breakage, chipping, scratching, thermal shock resistant; patented Designed by master Portuguese architect Alvaro Siza; authorized by the Port Wine Institute (IVDP) Quadrilateral stems designed with a "dimple" to encourage proper holding; packaged in a presentation box; dishwasher safe Made in Germany; Suggest wine varietals: Ruby & Tawny Port, Sherry, Madeira, Moscato, Auslese Riesling, Vin Santo, Sauternes & Barsac