With the wine glasses from the collection Riedel you get real high quality glasses in the house. The glasses are made of ultra-thin crystal glass which is very light. The Riedel Cabernet/Merlot Wine Glasses Performance are perfect for complex, full-bodied red wines with lots of tannins. The size of the chalice allows the flavors to fully develop in the glass. It allows the fruit flavors to come out more and actually reduces the bitterness of the tannins.