No, these wine glasses aren't about to tip over. They're perfectly balanced thanks to clever design. Made with lead-free crystal, these rolling wine glasses are as fun to look at as they are to sip out of. But they're not just good looking. Roll these glasses around to create a swirling motion that aerates wine and releases aroma. Set of 2 rolling tumblers. Lead-Free Crystal 12 oz .Dishwasher Safe .Viski, a name that epitomizes sophistication and expert craftsmanship, presents an enchanting selection of high-end glassware, barware, and wine accessories.