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. 2 Rolling Tumblers Lead-Free Crystal glasses honors the art of craft cocktails and fine wine with gorgeous crystal glassware. Designed with professional bartenders and sommeliers, glassware is made from high-quality lead-free crystal or durable glass.