Riedel O Wine Tumbler Cabernet/Merlot, Set of 2The Cabernet glass is perfect for full bodied, complex red wines that are high in tannin The generous size of this glass allows the bouquet to develop fully, and smooths out the rough edges It emphasises the fruit, playing down the bitter qualities of the tannin, and allows wines to achieve balance Designed in 2004, the RIEDEL O Tumbler was the first varietal specific wine tumbler in history O is an innovative take on the casual wine glass, based on