This cognac glass Open Up Ardent is fantastic for tasting all of your digestive. The refined glass will add perfect elegance to your table. They are sold in pack of 6. The glasses are made out of Kwarx, which provides a revolutionary shape convex and concave which provides a better oxygenation to your cognac and which promote the development of the largest flavors..This shape is revolutionary, the convex and concave provide a oxygenation and development of important flavors. The Open Up collection has 20 stemmed glasses and allow a tasting of all types of alcohol : red wine , white wine, rose wine, chmapagne , port , whiskey and cognac. You need to heat your glass in your hands ten minutes. Place the bottom of the glass in your palm so that the cognac is at an ambient temperature : 68 F.