Schott Zwiesel truly is the world's best crystal glass. Built on a 130-year tradition of the finest German glassmaking, Schott Zwiesel is the most durable, most beautifully designed and best-manufactured glassware on the market today. Completely lead-free and manufactured using the most environmentally sensitive technology available, Schott Zwiesel crystal glass is the leading choice among wine connoisseurs the world over. Its sculpted bowls and finely edged rims enhance the fullest appreciation of every vintage. Schott Zwiesel crystal glass has added titanium for strength and added zirconium for crystal clarity, making it dishwasher safe. This Schott Zwiesel Tritan Forte 24.7 Oz Claret Burgundy Wine Glass is offered by DEAN & DELUCA in a set of six.