Take the Riedel Vinum Cognac Hennessy Glasses- Set of 2 (6416-71) in hand to enjoy elegant evenings amongst family and friends alike. These glasses are machine-blown from lead crystal glass. Their elegant design has a bulb shape with a small evaporative surface designed to enhance the flavor of your choice beverage. Maintaining these dishwasher-safe glasses is a breeze though it is recommended that they are washed by hand. Smart: These glasses are machine-blown from lead crystal glass for a high attention to detail that enhances flavor. Elegant: They have an elegant bulb shape with a small evaporative surface. Easy: Maintaining these dishwasher-safe glasses is a breeze though it is recommended that they are washed by hand.