Schott Zwiesel Tritan® Crystal glass incorporates titanium and zirconium for exceptional durability and clarity. For additional strength, the most vulnerable areas of glasses - including rims and the areas where stems and bowls or stems and feet meet - are individually tempered, resulting in a construction that is highly break, chip, and scratch resistant. Each rim is laser cut to place wine perfectly on your guests' palates. Tritan® Crystal glass is also known for its impressive brilliance, with a luster reminiscent of a diamond. Even after 1,000 wash cycles, glasses do not show any discoloration, scratching, cloudiness, spotting, or stains. Schott Zwiesel Tritan® Crystal glasses are a wise investment towards providing your guests with a beverage or meal to remember.