Pay 9 GET 12. This set contains 4 pieces ouverture white wine, 4 pieces ouverture Magnum and 4 pieces ouverture champagne. The wine-friendly machine-made glass set Of the glass Collection ouverture is offered as an attractive value gift pack. Ideal to give as gift or to enjoy yourself. It is riedel’s uncomplicated entry level series for customers who appreciate good reasonable Priced wine. All Riedel glasses are dishwasher safe.