Schott Zwiesel's Iceberg collection is deceptively simple and classically elegant, this design brings a distinctive sense of elan to any gathering. Our Iceberg barware collection features an oversized weighted bottom glass, offset by tall straight sides. Highball or on-the-rocks, this elegant design is rock solid and straight up-, just the way you want it. Schott Zwiesel Crystal Glass is made from a formula that replaces lead with zirconium and titanium for brilliance and strength. Schott Zwiesel Crystal Glass is unrivaled for the elegance of its design yet it is dishwasher safe.