The ultimate gift for the whisky drinker, this incredible set includes two double old fashioned glasses and two silicone molds that produce 2.5" diameter ice spheres. The secret to Schott Zwiesel glassware’s longevity is their exclusive Tritan Crystal and manufacturing technology. By eliminating lead content from glass and replacing it with Titanium and Zirconium, Tritan Crystal delivers superior durability and brilliant light-reflecting appearance. Additionally, Schott Zwiesel reinforces the zones on their glassware most vulnerable to breakage: the rim, the junction of bowl and stem, and the junction of foot and stem. Independent testing has proven Schott Zwiesel glassware resists chips, scratches, breakage, discoloration, spots and stains even after 1,000 cycles in the dishwasher, helping it maintain its beauty and luster for a lifetime of use.