Vinum Extreme is machine made of fine lead crystal and is designed in the incomparable Riedel style to emphasize and enhance the flavors of every wine you drink. Recommend to hand wash. The Cabernet / Merlot / Bordeaux wine glass is ideal for full-bodied, complex red wines that are higher in alcohol and tannins. The generous size allows the wine to aerate in the glass and the bouquet to develop fully. The shape of the rim directs the flow of the wine to the front palate to enhance sweetness, thus accentuating the fruit while softening bitter tannins.