Schott Zwiesel (a brand of Zwiesel Kristallglas, AG) has a 130 year history of innovation and success, including such break through developments as the first machine made stemware and the first lead-free crystal glass. With the introduction of the proprietary Tritan Crystal technique (the result of special compositions such as titanium with a unique tempering process) Zwiesel has once again revolutionized the industry. Rigorous laboratory testing proves the brilliance, dishwasher safety, and break resistance of Tritan. We invite you to discover why we call our product "The World's Best Crystal Glass" and why it is the choice of the finest restaurants, resorts, and sommeliers worldwide.