It's a magnum of Alexander Valley Vineyards flagship wine Cabernet Sauvignon.  

The 2015 Cabernet Sauvignon is a classic Alexander Valley wine with medium body, great fruit flavors and smooth, structured tannins. Winemaker Kevin Hall added 11% Merlot for structure, a touch of Cabernet Franc for floral notes and Malbec and Petit Verdot for color. There are aromas of black cherry, cassis, plum, slight blueberry vanilla, oak and chocolate. In the glass there are rich flavors of cherry, cassis, blackberry, spice and chocolate. This is a fruit forward wine with nice balance and a long, juicy finish. This magnum is the equivalent of two 750 ml bottles.